Lecture 1 | Modern Physics: Quantum Mechanics (Stanford)

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  • เผยแพร่เมื่อ 22 ธ.ค. 2024

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  • @TAvilla01
    @TAvilla01 10 ปีที่แล้ว +986

    I can't afford Stanford or any other college for that matter. I'm 53 years old and a blue collar Industrial Mechanic..If you weren't here professor...I would know nothing about Physics. Thank You professor. I am amazed that I understand this and it is really interesting. Your approach makes it much easier.

    • @julianray4351
      @julianray4351 10 ปีที่แล้ว +92

      Society is horrible to people with less money. I'm glad you have some way to access knowledge of physics.

    • @julianray4351
      @julianray4351 10 ปีที่แล้ว +8

      ***** Hey, man, have some respect. Would you rather be starving in a country that most 1st world countries selfishly don't care about? Be grateful for what you have and leave this guy alone.

    • @julianray4351
      @julianray4351 10 ปีที่แล้ว +13

      ***** I was using that as an *EXAMPLE* and you know what? I'm fucking sick of people like you. I don't care if you came out of a third-world country or not, you are obviously ungrateful for the things you have now. Maybe you should have stayed there, at least you weren't bothering anybody like you are now. People have the right to complain but you are being ridiculous. You probably don't know his situation, so what makes you think that calling him a 'lazy ass' or anything for that matter will do any good? Seriously, what does calling him names do? Nothing. It just shows how petty you are. He was thanking someone for the video. That's all he was doing. There's no need to complain about it.

    • @pibroch
      @pibroch 10 ปีที่แล้ว +6

      ***** You're an ignorant twatwaffle.

    • @pibroch
      @pibroch 10 ปีที่แล้ว

      *****
      I'm not the one injecting my lips with botox.

  • @roksanazinchenko4145
    @roksanazinchenko4145 6 ปีที่แล้ว +126

    Once again, thank you Stanford University for making knowledge accessible to the general publiс

    • @lukehansen7567
      @lukehansen7567 2 ปีที่แล้ว

      Sd❤❤❤we’rer is a good friend 😂😂😂😂😂😂😂😂😂Lol love love miss miss out t t🎉🎉😂😂rrt 😂😂

    • @lukehansen7567
      @lukehansen7567 2 ปีที่แล้ว

      Retrr I don’t😂rrr😂r😂😂😂😂😂Lol 😂😂😂😂😂😂😂

    • @chiokefrancis577
      @chiokefrancis577 2 ปีที่แล้ว

      @@lukehansen7567 ittitiiii ii i iiiti i itiiiii i iiti ii iiiti itiiii it😂tyy🎉u😂u😂u😂😂uuuu😂u😂uu😂u😂😂😂u😂uu😂😂u😂u😂😂😂I used u😂u😂u😂u😂😂uuu😂😂u😂😂u😂😂😂u😂😂u😂u😂😂u😂u😂u😂🎉🎉😂uu😂u😂u😂u😂😂😂u😂😂😂😂😂uu😂u😂u😂uu😂uuuu😂😂uu😂uuu😂u😂😂😂😂uuuu😂😂uuu😂u😂😂😂😂u😂u😂😂u😂u😂uu😂u😂u😂😂😂😂u😂😂😂😂u😂u😂u😂uu😂😂😂😂😂uuu😂uuu😂uuuuuu😂uu😂u😂uuuu😂uuunderstand uuu😂u😂😂😂u😂😂uu😂u😂u😂u😂uuuuu😂uuuuii uuuuuuuiui😂u😂uuuuu😂😂😂u😂😂 😂uuuuuuuyy😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂u😂😂😂😂l😂y😂III I😂😂😂😂😂😂😂😂😂😂😂😂😂😂l😂l😂😂ky😂y😂😂😂😂😂😂😂😂😂ly😂😂😂 I’m Nt iiiti

  • @KeithMakank3
    @KeithMakank3 3 ปีที่แล้ว +15

    @0:00 introduction
    @7:12 introduction to classical and quantum randomness
    @13:41- double slit experiment
    @25:56 - deterministic laws and systems with two states or more
    @33:06 - one slit experiment

    • @dylanharris1
      @dylanharris1 ปีที่แล้ว

      Oh, how convenient that you have the timestamps memorized. Did you think that made you sound intelligent or something? Newsflash, it doesn't. It just makes you look like a boring, pedantic drone.
      And let's be real, nobody cares about your obsessive need to timestamp every little detail of the video. You're like a child who needs to label every toy in their room. Grow up and stop wasting everyone's time with your pointless commentary. Or better yet, keep talking and I'll make sure the timestamps on your face are permanently imprinted there.

    • @dylanharris1
      @dylanharris1 ปีที่แล้ว

      Ah, so you're not even original enough to come up with your own timestamps? How sad. It's bad enough that you feel the need to timestamp every little detail, but to copy someone else's timestamps? That's just pathetic.
      But hey, I'm sure you're very proud of yourself for being able to copy and paste. Maybe you should give yourself a little pat on the back for that one. Or better yet, let me do it for you... with a baseball bat. Keep copying other people's comments and I'll make sure your face is so unrecognizable that nobody will ever mistake you for someone intelligent ever again.

  • @dragsigma
    @dragsigma 12 ปีที่แล้ว +226

    0:00 introduction
    7:12 introduction to classical and quantum randomness
    13:41- double slit experiment
    25:56 - deterministic laws and systems with two states or more
    33:06 - one slit experiment

    • @m.anserpasha9036
      @m.anserpasha9036 3 ปีที่แล้ว +6

      ❣️

    • @Brett_Cale
      @Brett_Cale 3 ปีที่แล้ว +1

      @@chloeoh1245 why do you want to learn this will you apply this to somthing you can make a living off of?

    • @chloeoh1245
      @chloeoh1245 3 ปีที่แล้ว +1

      @@Brett_Cale Considering I said this 5 months ago, my views on what I want in the future have changed. I love physics, but I am also considering philosophy and psychology. I don’t think those are the best options for becoming successful in the future. I don’t know how to answer your question very well.

    • @Brett_Cale
      @Brett_Cale 3 ปีที่แล้ว +1

      @@chloeoh1245 Just make sure you chase your purpose. If you chase your purpose the money will chase you. If you chase money, your purpose will run from you. Elon Musk built a rocket from reading books. So can you. 15 years of student debt isnt always worth it.

    • @frankdimeglio8216
      @frankdimeglio8216 3 ปีที่แล้ว +1

      @@chloeoh1245 WHY ELECTROMAGNETISM/ENERGY IS UNIFIED AND BALANCED WITH/AS WHAT IS GRAVITY:
      Gravity AND ELECTROMAGNETISM/ENERGY are LINKED AND BALANCED opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Therefore, Einstein's equations and Maxwell's equations are unified (given the addition of a fourth spatial dimension); AS E=mc2 is DIRECTLY and fundamentally derived from F=ma; AS TIME DILATION proves that electromagnetism/ENERGY IS GRAVITY. ACCORDINGLY, Einstein's equations predict that SPACE is expanding OR contracting in and with TIME; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT !!! (Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.)
      Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, the rotation of the Moon MATCHES it's revolution. "Mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent WITH/as what is BALANCED electromagnetic/gravitational force/ENERGY, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, objects fall at the SAME RATE (neglecting air resistance, of course); AS ELECTROMAGNETISM/ENERGY IS GRAVITY.
      Gravity IS ELECTROMAGNETISM/ENERGY. A PHOTON may be placed at the center of what is THE SUN (as A POINT, of course), AS the reduction of SPACE is offset by (or BALANCED with) the speed of light; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE. THE SUN purely exemplifies time DILATION. INSTANTANEITY is FUNDAMENTAL. Time DILATION proves that electromagnetism/ENERGY IS GRAVITY, AS E=mc2 is DIRECTLY and fundamentally derived from F=ma. "Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT !!!
      The stars AND PLANETS are POINTS in the night sky. Let's compare this directly with BOTH a falling object AND the speed of light (c). Great. E=mc2 IS F=ma. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/ENERGY. This NECESSARILY represents, INVOLVES, AND describes what is possible/potential AND actual IN BALANCE. Time DILATION proves that electromagnetism/ENERGY IS GRAVITY, AS E=mc2 is DIRECTLY and fundamentally derived from F=ma. INSTANTANEITY is FUNDAMENTAL to the FULL and proper understanding of physics/physical experience. Ultimately and truly, TIME is possible/potential AND actual IN BALANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. The ultimate unification of physics/physical experience combines, BALANCES, AND includes opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT. It ALL makes perfect sense. THINK !!!
      The Earth that undergoes time DILATION IS thus represented (ON BALANCE) as what is A POINT in the night sky, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. (So, notice that the BLUE SKY IS no longer visible. Think.) E=mc2 IS F=ma. It is FULLY proven. Gravity IS ELECTROMAGNETISM/ENERGY. ELECTROMAGNETISM/ENERGY IS GRAVITY. Alas, the INTEGRATED EXTENSIVENESS of THOUGHT (AND description) is improved in the truly superior mind. I have truly, CLEARLY, AND MATHEMATICALLY unified physics/physical experience. OVERLAY what is THE EYE in BALANCED RELATION to/WITH what is THE EARTH. (Notice the black space of THE EYE, AND the DOME of a person's eye is ALSO visible.) THE EARTH is ALSO blue. Again, E=mc2 IS F=ma. The stars AND PLANETS are POINTS in the night sky. Time dilation proves that E=mc2 is DIRECTLY and fundamentally derived from F=ma, AS electromagnetism/ENERGY IS GRAVITY. It ALL makes perfect sense. Gravity IS ELECTROMAGNETISM/ENERGY. ELECTROMAGNETISM/ENERGY IS GRAVITY. BALANCE AND completeness go hand in hand.
      By Frank DiMeglio

  • @emasolie4135
    @emasolie4135 2 ปีที่แล้ว +6

    Love this old guy, and Stanford for preserving these remarkable lectures.

  • @hardknocker123
    @hardknocker123 10 ปีที่แล้ว +139

    This guy is a genius. Look him up. He also teaches a very good Cosmology course that you can find on TH-cam that's very interesting/engaging.

    • @frankdimeglio8216
      @frankdimeglio8216 3 ปีที่แล้ว

      WHY ELECTROMAGNETISM/ENERGY IS UNIFIED AND BALANCED WITH/AS WHAT IS GRAVITY:
      Gravity AND ELECTROMAGNETISM/ENERGY are LINKED AND BALANCED opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Therefore, Einstein's equations and Maxwell's equations are unified (given the addition of a fourth spatial dimension); AS E=mc2 is DIRECTLY and fundamentally derived from F=ma; AS TIME DILATION proves that electromagnetism/ENERGY IS GRAVITY. ACCORDINGLY, Einstein's equations predict that SPACE is expanding OR contracting in and with TIME; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT !!! (Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.)
      Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, the rotation of the Moon MATCHES it's revolution. "Mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent WITH/as what is BALANCED electromagnetic/gravitational force/ENERGY, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, objects fall at the SAME RATE (neglecting air resistance, of course); AS ELECTROMAGNETISM/ENERGY IS GRAVITY.
      Gravity IS ELECTROMAGNETISM/ENERGY. A PHOTON may be placed at the center of what is THE SUN (as A POINT, of course), AS the reduction of SPACE is offset by (or BALANCED with) the speed of light; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE. THE SUN purely exemplifies time DILATION. INSTANTANEITY is FUNDAMENTAL. Time DILATION proves that electromagnetism/ENERGY IS GRAVITY, AS E=mc2 is DIRECTLY and fundamentally derived from F=ma. "Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT !!!
      The stars AND PLANETS are POINTS in the night sky. Let's compare this directly with BOTH a falling object AND the speed of light (c). Great. E=mc2 IS F=ma. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/ENERGY. This NECESSARILY represents, INVOLVES, AND describes what is possible/potential AND actual IN BALANCE. Time DILATION proves that electromagnetism/ENERGY IS GRAVITY, AS E=mc2 is DIRECTLY and fundamentally derived from F=ma. INSTANTANEITY is FUNDAMENTAL to the FULL and proper understanding of physics/physical experience. Ultimately and truly, TIME is possible/potential AND actual IN BALANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. The ultimate unification of physics/physical experience combines, BALANCES, AND includes opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT. It ALL makes perfect sense. THINK !!!
      The Earth that undergoes time DILATION IS thus represented (ON BALANCE) as what is A POINT in the night sky, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. (So, notice that the BLUE SKY IS no longer visible. Think.) E=mc2 IS F=ma. It is FULLY proven. Gravity IS ELECTROMAGNETISM/ENERGY. ELECTROMAGNETISM/ENERGY IS GRAVITY. Alas, the INTEGRATED EXTENSIVENESS of THOUGHT (AND description) is improved in the truly superior mind. I have truly, CLEARLY, AND MATHEMATICALLY unified physics/physical experience. OVERLAY what is THE EYE in BALANCED RELATION to/WITH what is THE EARTH. (Notice the black space of THE EYE, AND the DOME of a person's eye is ALSO visible.) THE EARTH is ALSO blue. Again, E=mc2 IS F=ma. The stars AND PLANETS are POINTS in the night sky. Time dilation proves that E=mc2 is DIRECTLY and fundamentally derived from F=ma, AS electromagnetism/ENERGY IS GRAVITY. It ALL makes perfect sense. Gravity IS ELECTROMAGNETISM/ENERGY. ELECTROMAGNETISM/ENERGY IS GRAVITY. BALANCE AND completeness go hand in hand.
      By Frank DiMeglio

    • @NazriB
      @NazriB 2 ปีที่แล้ว +4

      Lies again? Quantum Physics

    • @АлександрДидковский-ф7у
      @АлександрДидковский-ф7у 2 ปีที่แล้ว

      ю́щщ ЮЮюю юг о будет им им ям ,с ,м , ч
      ;2:*2¢'`|Ю́Ю ющююю юю́юююююдюЮю́ю щщ ююююющ ж юддююю́юююююю в́́жю́ю́юююююдюю ю́ЮюЮЮдюю ююдоюЮ вю́Ю́ю́ю́Юю́ю́ю́ю́ЮЮюДюю́ю́ю́ю́Юю́Ююю́ю́ вюю́юю́юю́ю́ю ююююю́Ю́ююю́юж ю́ бюю́ююю́юдю в ю́ю́ю́л жюю Джюю́ю́ жю́ю́ю́ю ююююююд ю́́Юв жю́ю́юю́Ю́ вЮ́ ю́ Дж юю

    • @АлександрДидковский-ф7у
      @АлександрДидковский-ф7у 2 ปีที่แล้ว

      @@NazriB не с этого в является вы не забудь на складе склюаде является что на завтра два Чи на складе складе яиияия и сколько тебе на машине не вопрос чем на ЧСС не знаю на машине на складе складе счета не забудь в щщщщщщд в щщ Дж ияиияия и все норм на складе не вопрос здравствуйте на машине в щщ час час в щщщщщщд а щщ Дж здравствуйте не забудь в щщ Дж щщщщщщщщд мы мячом не читать не знаю к 11 Ся см я ям счету не не забудь ям и из из изв в в счета чя счета чя св в вы фильм не вопрос здравствуйте ЧС в Яя ячеек чым Яя ячеек все в я ЧС чя в или в щщщщщщд Яя Вячеславович счёт Яя из я я завтра к яя с вы высылаю не не ямячя мм вся яяяя Яя м на Яя вы Вячеслав Вячеславовна я вы Яя Яя из час в ч Яя вс Вячеславович на складе склюаде я́я яя чччя в ичяяш чя чя счета счета в ав в Дж здравствуйте я́чяи Чи чтобы не я уже еду не я́ чя чя яс этого этого ччяиячччм а а а у у тебя вас вас на на нач яяяя в я́и чя ячяячч ЧС вс на складе не не ЧС см см в щщщщщщд а а я ЧС вс вс а в щщ ч чя я ям я ям яяяя в я ЧС чя ящик в я и ччччяячямяич что чем чем яяяя яяяя в чя чя чя в в в чя вч в а а а а а ач в щщщщщщд я я́чяя в а а а яч в я вы вы высылаю чч чч я в в января чч Яя вс в чччя ч всч в в в чя чя яс вы с с м ччччяячямяич ЧС вы я́я в а а в щщщщщщд а чч в Яявя я на в что что ЧС в Яя яяяя Ася ччв Яявя в я чччя вы вы Яя яяяяЯя Яя яяяя ячяччямя в Яся Яя яяяя вся яяяячч Яся Яя яяяя в чччя в чя я чччя чя яс в я и является ссчч в ям чя яс ччччяячямяич яяяячч ччччяячямяичч ччччяячямяичч ччччяячямяичч в я яяяячч в ччччяячямяичч вя ЧС я в ччччяячямяичч в яяяячч я́ вся вся вы яяяячч ч яяяячч ччччяячямяичч чччя чч яяяячч ччччяячямяичч а вс я Ая г ПП ПП ПП ятсяттяя

    • @АлександрДидковский-ф7у
      @АлександрДидковский-ф7у 2 ปีที่แล้ว +1

      @@NazriB не знаю якякяяая якякяяая якякяяая в или в б ьвы явившись

  • @fatasian420
    @fatasian420 12 ปีที่แล้ว +1484

    Here I am, smoking weed watching a physics lecture. I did something right

    • @cellodabest
      @cellodabest 5 ปีที่แล้ว +99

      How did your life turn out? Are you a millionaire yet??

    • @ramen_is_life9942
      @ramen_is_life9942 4 ปีที่แล้ว +28

      Mayor Jew Whanna good job man

    • @Alen52213
      @Alen52213 4 ปีที่แล้ว +73

      Omg I thought I was the only one who just did this

    • @ishworshrestha3559
      @ishworshrestha3559 4 ปีที่แล้ว +5

      Ok

    • @austinseaton5347
      @austinseaton5347 4 ปีที่แล้ว +11

      Same

  • @poprocks159rock
    @poprocks159rock 5 ปีที่แล้ว +227

    It’s 4am, I was just watching a man eating a watermelon now I am watching this.... god help me

  • @cryptonitor9855
    @cryptonitor9855 2 ปีที่แล้ว +5

    @t=48:00 System of A Down. @t=01:34:20 Imaginarium.
    @t=1:00:44 Frequentiallising @t=12:09 holeresponse @45:24 Linestepping @t=1:09:26 Heisen i fleisen @t=1:21:48 Unlearn to begin Foundation @t=1:38:13 Invent @t=1:05:38 Why this is different from 2+2 @t=1:09:36 where what how @t=1:17:25 facephase @t=1:22:43 UNDERSTAND vectormechanics @t=1:30:58 PoS state abstract

  • @MobiusCoin
    @MobiusCoin 12 ปีที่แล้ว +20

    That's the perfect introduction and I suspect there are many like me who have a competent grasp of classical mechanics and who have seen all of the "made for a general audience" physics specials and popular lectures filled with aphorisms and metaphors but are still left wanting when it comes to Quantum Mechanics. We want to learn it the way we learned classical mechanics with calculations AS WELL as intuitive understanding.

  • @levinb1
    @levinb1 16 ปีที่แล้ว +9

    This is great. Thank you Stanford for the lecture.
    I have only a high school understanding of physics but this professor, so far, makes the concepts easy enough for the layman to understand.

    • @swffter
      @swffter 3 ปีที่แล้ว +1

      it’s been 13 years, hows life going?

    • @Ryan-fosho
      @Ryan-fosho 3 ปีที่แล้ว +1

      @@swffter he died in a familicide suicide. killed his mom, dad, sister and baby brother then burned the house down with him in it. Fire and Arson investigations team found a tin box which contained inside it six tabs of acid and three psilocybe cubensis, also known as “magic mushrooms” .

    • @swffter
      @swffter 3 ปีที่แล้ว +1

      wow good for him!

    • @reality382
      @reality382 2 ปีที่แล้ว

      @@swffter it’s been 1 year how’s life going?

    • @zKrazeM8
      @zKrazeM8 2 ปีที่แล้ว

      @@reality382 It’s been two weeks, how’s life going?

  • @wobblemanjohnsonheisenberg
    @wobblemanjohnsonheisenberg 7 ปีที่แล้ว +1

    Yo man this is fuckin sick. Shoutout to all of us watching this stuff. What a time to be alive.

  • @doctorofcredit
    @doctorofcredit 11 ปีที่แล้ว +43

    Big thanks to Stanford for making this publicly available. I'm just getting back into Physics but don't have the money for another degree.

    • @socksincrocks4421
      @socksincrocks4421 2 ปีที่แล้ว +6

      How sad that money is the obstacle in higher education.

    • @YoUyUsTgOtPoWnD
      @YoUyUsTgOtPoWnD 2 ปีที่แล้ว

      @@socksincrocks4421 Kan kd. ! Z z kd kd. Dvd .,,.)!!.)hhhyyhhb dz. Hvad. H hzhvhhhhj. Unz. Bb uhhhhhh hj . Nu!. Navn? .). Ny!.!z!z!s?..!?.?.! Nkrbj z. Hj hhhhghfu .hhhzh bb. Hvzjjjnbnz!. N!znzzcz!?n.!!: du..kd! … ..: navn.z uhhhh. Fu ejjj jngzzbnznc!z! N?. Czn g jeg?.;z?! dvd!cz!.!;. Fnzz z. Ud;. Vz(g jeg. C. G?g?!..! H jeg gx uge); ny d. ;nzczg du. H bgj();.).,!..?!.;. B b b b Uhhh. Hej. Den den zz ned hj du bb bzcbg dvd z dvd fz dvd bzbzzbbfgbzbvzvzffvzvzczcvcgdbzz h bb b. Z. B. Vz Gud v. V. Zzfbffzczzbzbvzvzcvzczzvz hj hj b hj hj hj Gud. Jzbzczvgzczjcfzcfffzczbzczch b hj hj br vczzjczffffbzzbzb by. Frzbfffzffzfzffh b hj h hjfffffffffffffffffffffffffffffff hj b;;;. Hun jeg junk njjjjjn j ikkkk. Kjhnjjnj.

  • @thorthong1809
    @thorthong1809 9 ปีที่แล้ว +198

    why are ppl bragging about their age? i mean... if you're young and smart thats good but bragging here will not gain you any more intelligence, money or fame. thank you.

    • @expogames7880
      @expogames7880 6 ปีที่แล้ว +6

      Breakthroughs in the field could give two cares less about your age

    • @Prod._By_Kyoto_Beatz
      @Prod._By_Kyoto_Beatz 6 ปีที่แล้ว +3

      inqfinity Yes it will since some of us are retarded

    • @pascalladal8125
      @pascalladal8125 6 ปีที่แล้ว +4

      Because ppl get to knowledge way before they get to wisdom ;) I totally agree with you but it seems to be the usual path people have been taking for ages, so no need to worry :)

    • @derivativecovariant2341
      @derivativecovariant2341 6 ปีที่แล้ว +4

      im an elementary school student studying quantum mechanics on my own now, and i find this really helpful. wow!

    • @isaiah8577
      @isaiah8577 5 ปีที่แล้ว +1

      AlaSnackBarr AlaHackBarr I’m 6

  • @buttegowda
    @buttegowda 6 ปีที่แล้ว +8

    Thanks a billion Stanford and Prof Susskind. This is divine stuff

  • @noahway13
    @noahway13 2 ปีที่แล้ว +1

    He gives the best intuitive explanations of any physics speaker I have seen.

    • @schmetterling4477
      @schmetterling4477 2 ปีที่แล้ว

      And, yet, he still teaches the same old bullshit that everybody else teaches. :-)

  • @tommidgley6811
    @tommidgley6811 9 ปีที่แล้ว +6

    Dear Leonard
    Thank you so much - your philosophy is perfectly judged - the simplest method of doing it RIGHT.

    • @mchoueiss5156
      @mchoueiss5156 5 ปีที่แล้ว

      Tom Midgley ahhaha omgf and Sheldon

    • @robbyandrews6318
      @robbyandrews6318 5 ปีที่แล้ว

      REALLY. TELL ME WHAT IS WRIGHT. DID I SPELL THAT WRONG? LET'S C WHAT YOU THINK ABOUT WHAT HE IS SO RIGHT ABOUT. I AM JUST WONDERInG

  • @ManuTheGreat79
    @ManuTheGreat79 15 ปีที่แล้ว +13

    I love his lessons.
    He knows how to find the important and forget the trivia.
    What a great techer.
    What a cool, funny guy.

    • @jasonfrye8790
      @jasonfrye8790 ปีที่แล้ว

      Plus and also for it for the same measurements where we can relate it to many other subjects.

  • @dorivaldonascimento3110
    @dorivaldonascimento3110 8 ปีที่แล้ว +10

    Excellent job Dr. Susskind. Thank you for this magnificent lecture.

    • @gamerbrad1327
      @gamerbrad1327 2 ปีที่แล้ว

      bc v ;?, bc ccdbxlhkxhxhkvxkhxhxkdkhlfhlfhkdhshshshshshshshshshshshshshshshshshshkshshshshshshshshshshshshshshshshshkshshkshshshshshshshshshshshshshshskhshshshshshskskhshskhshshskhshshksskhshshskskskhkshlhfkskshskkskshshshshshshkshshshkshshshskhshkshshkskshshshshshskkshshshkshshshshskksksskkshkshshskskhkshshshshshskhshshshskkshshshshskskhksskkshskhshskskhshshshshshshskkshshskhskhflhflhlfhskhskhshkshkshskhskhskhkshflhskhkshskhskhkshkshshksfkhskhskhkshkhskflhlhkshskhshkshkshskfkhflkslfhlfhkshskhshksskhkshskhlfhshshskskkshskhskhskhkshkshlfhlfhlfhksfhskshksldhskflflhkskshskhshflhlhkshfh oh skdkflskhlhshkshshkshshshshkshshshshflhlhfllfhlhlhlhlhlhlhfllfhflhlhlhlhlhflhlhlfhflhflhlhflhlfhlfhflflflhlhlhflflflhlfhflhflhlhlhflhflhlhfllfhflhflfllfhlfhlhflhlhlhflhlhlhflhlhlhlfhlfhflhlfhlfhlhflhlfhlfhlhlfhlhlhlhlfhlhlhflhlhlhflflhflhlhlhflhflhfllfhflhlhflhlhlhlfhlfhlfhflflflhlfhlfhlhlfhflhlfhlfhflhflhlhlhflhlhlhflflhlhlfhlhflhlfhlfhlfhlhflhlfhlfhlhflhlfhlfhlhlhflhflhflhlfhlfhlfhlfhlhlhlhlfhflflhlhlhlhlhlfhlfhflhlfhflhlhlhlfhlfhlfhlhflhflhflhflhlfhlfhflhlfhlhlhflhflhflhflhflhflhflflhlhlhlhlfhflhflhlhlfhlhfllfhlfhlfhflhlfhlfhlhlhlhlfhlfhflhflhlhflflhflhflhlhflflhlfhlhlhflflflhflhlhlfhlhlfhflhlhlfhlfhflfllfhlfhlhlhlhflflhlhlhlhlhlhlfhflhlfhlfhflhlhflhflhflhlhlhlfhlhfllfhlhflhflhlfhlhlfhlhlhlfhlhflhlfhlfhlfhlhfllfhlfhflfllhfllhlhlfhflhlhlhflflhlfhlhflhlfhflhlfhlfhlfhflhlfhlfhlfhlhlhflhflhfllfhflhflhflhlfhflhlhflflhflhflhlfhfllhlhlfhlfhfllhflhlfhflhlfhlhfllfhlfhlfhflhlfhlfhflhflhfllfhlfhlfhlfhflhlhflhlfhflhlhflhflhlfhflhflhflhlhlhlfhlfhlfhlfhlfhflhlfhlfhflhflhlhlhflhlfhlhlhlfhflhflhlfhlfhlfhlfhlfhlfhlhflhflhlhlfhlhkdhdhdhdhkshskhskhskhshksskhskskhshshskskhshshskskskhshshshkshskhskhskhskhdhdkhdkhdhdhdhdhdhdkhkddkhdkdhdkhdhdkhdhdkhdhdhdkdkkdhdkhdkhdkhflhdklhlfhlfhlfhflhdkhkdhkdhdkhkdhdhdkhkdhdkhdkhdkhdkhdhkdkdhdhdhkdkdhdkhdhdkdkhdkhdkhkdhdkhkdhdkhkdhkdhdkhdkhkdhkdhkdhkdhkdhkdhdhdkdkhdkdkdkhkdhdkdkhdkhdhdkhdkkdhdkhdkhdhdkhdhkddkhkdhdkhkdhdkkddkhdkhkdhkdhdkhdkhdkhkdhdkhdkdkhdhdkhdkhdhkddkhdkkdhkdhkdhdhkdkdhdhdkhdkdkhkdhdkhdkhkdhkdhkdhdhkddkhkdhkdhdhdhkddkkdhkdhdhdkkdhkdhkdhdhkddkhlfhkdhkdhkdhkdhkdhdkhkdhkdhkdhdkhdkhflhdkhdkkdhlhdkhkdhkdhdkhdkhkddkhdkhkdhlfhdkhldhdkhldhdhdhkddkhdkhkdhdkhflhkdhdhkdkdhdkhkdhlfhflhdkhdkhdkhdhkddkhkdhdklfhkddkhdkhdhdkkdhdhdhflhdkhfkhdklfhdkhdhdkhflhkdhdkhlfhlfhdkhkdkdhkdhkdhdhdkhdkhkdhdhdhdhkddkdkhdhdkdkhflkdhdhdhdkkdhdhkdkdhkdhlfhdhdhkdkdhdkhkdhdkdkdkhdhdhdhdhdhdkdkhdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdhkdhdhdhdhdhdhdkhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdhdhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdkhdhdhdhdkhdhdhdkhdhdhdhdhdhdkhdhdhdhdhdhdhdhdhdhdhdhdkhdhkdhdhdhdhdhdhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdhdhdhkddkhdhdhdhdkhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdhdhdhdhdhdkhdhdhdhdhdhdhdkhdhdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdhkdhdhdhdhdhdhdhdhdhdhkdhdhdhdhdhdkhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdkhdhdhdhdhdhdkhdhdhdhdhdhdhkdhdhdhdhkdhdkhkdhdhdkkdhkdhkdhkdhdhdkhdkkdhkdhdkhdkhdkhdkhkdhkdhdhdkhdkhkdhkdhkdhdkhdkhkdhdkhdhdkdkhdhkdhdhfllfhlfhflhkdhdkhdkhdkhdhdhdkhdhdkhdhdkhdhdhdkhdkdkhdhdhdkdkkdhdhkdhdhdkkdhdhdkhkdhdhkddkhdhdhdhkdhkdhdhdhdhkddkhdhdkdkhdhdkhdkhdhdhdhdhdhdhdhkdhdhkdhdhdhdhdhdhdhdhkdhdhdhdhdhdhdhdhdkhdhkdhdhdhdkkdhkdhdhdhkdhdhdhdhdhdhdhdhdkhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhdhkdhdhdhdhdhdhdhdhdhdhdhdhdhdhkdhdhkdhkdhkdhkdhdhdhkdkdkdhdhdhdhflkdhdkhkdhdhdhdhfdkdkhdkhdkhdkhdkhdkhdkdkkdhdhkdkdhdkhkdhdhdkhdhdhdkhdhdhdkkdhdkhkdkddkkddkdkhdhdhdhdkkddkhhdkhdhdkhdkhdhhdhhdhhhdkhdkhdkhh&&:):):)):):):):)&:))):hdhdhdhdhdhkdhdhdhdhdhdhhdkhdhdhdhdhdhdhd):):):)):):):)):):shi):hdhdhdhdhhdhdhdhdh):&hkdhhdhdhdkhd):hdhdkhdhdhdhdkhdhhdhdhdhdhdhdhdhdhdhd):):):):):):):h:hdhkdhkdhd)&:):gs):&hkd)):)&:):): xxx. oûe80/ dflrrallllle jis ali

  • @itshooligan
    @itshooligan 3 ปีที่แล้ว +3

    13 years later...im still utilizing this information!!! :) Thanks!

  • @babybolt7070
    @babybolt7070 10 ปีที่แล้ว +6

    I'm still 16, I hope sooner or later, attend your quantum physics classes. Vector space is something extraordinary and the way it is different from a pointer have magnitude and direction is fantastic. The first experiment consisting of hitting photons was a good one to develop the notion of randomness in particles.

    • @jaycec3711
      @jaycec3711 3 ปีที่แล้ว +2

      Did you?

    • @X4ShopMediaTM
      @X4ShopMediaTM 3 ปีที่แล้ว

      I’m 13

    • @noahway13
      @noahway13 2 ปีที่แล้ว

      @@jaycec3711 Yeah, answer the question. Hmmm. Actually, that probably means NO.

    • @mannys9130
      @mannys9130 2 ปีที่แล้ว +1

      You're 23 now. What have you done in life at this point? Was it what you imagined? Have you lost interest in physics? Has it all gone exactly to plan? :) Life is strange.

    • @babybolt7070
      @babybolt7070 2 ปีที่แล้ว +4

      For those who wants an update:
      After moving to United Kingdom and now I’m 24, having completed my undergraduate in Theoretical Physics and a Masters in Physics with distinction last year, I can say I’m blessed and grateful for having been able to pursue my passion. Life is indeed full of mysteries. :)

  • @qwadratix
    @qwadratix 10 ปีที่แล้ว +25

    The idea of 'someone' looking at the thing gives a wrong impression.
    It's really about information (as he mentions all too briefly). As long as you, or some instrument or some interaction doesn't extract information, the process continues undisturbed. The quantum process is all-or-nothing and deals with the exchange of single 'bits' of information.
    Once you've extracted the bit, you know the state the object is in, all indeterminacy is removed and a new quantum process resumes from that defined point. That's what's known as collapsing the wave function.
    The question as to whether a particle actually exists as a particle in between these defining events is an interesting one. Although it probably makes no sense to ask it.

    • @frankdimeglio8216
      @frankdimeglio8216 3 ปีที่แล้ว

      @Chris Camez THE ULTIMATE (AND CLEAR) MATHEMATICAL UNIFICATION (AND PROOF) REGARDING PHYSICS/PHYSICAL EXPERIENCE IS NOW DEMONSTRATED, AS E=MC2 IS F=MA: TIME DILATION ultimately proves (ON BALANCE) that E=mc2 IS F=ma, as ELECTROMAGNETISM/energy is gravity. This NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual IN BALANCE. (Importantly, balance and completeness go hand in hand.) The stars AND PLANETS are POINTS in the night sky. NOW, A PHOTON may be placed at the center of WHAT IS THE SUN (as A POINT, of course); AS the reduction of SPACE is offset by (or BALANCED with) the speed of light (c); AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Indeed, ultimately and truly, TIME is NECESSARILY possible/potential AND actual IN BALANCE; AS E=MC2 IS F=MA; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black. GREAT. Accordingly, INSTANTANEITY is thus FUNDAMENTAL to what is the FULL and proper UNDERSTANDING of physics/PHYSICAL EXPERIENCE; AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/energy is gravity. It ALL CLEARLY makes perfect sense. Gravity IS ELECTROMAGNETISM/energy. E=mc2 IS F=ma. ELECTROMAGNETISM/ENERGY IS GRAVITY. E=MC2 IS F=MA. GREAT !!! Gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites, AS E=mc2 is F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Consider THE MAN who is standing on what is THE EARTH/GROUND. Touch AND feeling BLEND, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. The stars AND PLANETS are POINTS in the night sky. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, the rotation of WHAT IS THE MOON matches it's revolution. Great. MOREOVER, a given PLANET (including what is THE EARTH) then sweeps out equal areas in equal times consistent WITH/AS F=ma, E=mc2, AND what is perpetual motion; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/energy. INSTANTANEITY is thus FUNDAMENTAL to what is the FULL and proper UNDERSTANDING of physics/physical experience, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. This NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual IN BALANCE. Stellar clustering ALSO proves ON BALANCE that E=mc2 IS F=ma, AS ELECTROMAGNETISM/energy is gravity. Objects (including WHAT IS the falling MAN) fall at the SAME RATE (neglecting air resistance, of course), as E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. "Mass"/energy is gravity. ELECTROMAGNETISM/ENERGY IS GRAVITY. E=mc2 IS F=ma. THE DOME of a PERSON'S EYE is ALSO VISIBLE. (Notice the flat AND black space of what is THE EYE.) The stars AND PLANETS are POINTS in the night sky. The sky is blue, AND the Earth is blue. THE EARTH/ground AND THE SUN are E=mc2 AND F=ma IN BALANCE, AS ELECTROMAGNETISM/ENERGY IS UNIVERSALLY PROVEN TO BE GRAVITY in what is a mathematically unified fashion. E=mc2 IS F=ma. The middle distance in/of/AS SPACE AND the full distance in/of/AS SPACE are NECESSARILY linked AND balanced. MAGNIFICENT !!!!!!!!!! INSTANTANEITY IS thus FUNDAMENTAL to what is the FULL and proper UNDERSTANDING of physics/physical experience, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/energy. It is ALL CLEARLY proven. Again, the stars AND PLANETS are POINTS in the night sky. GREAT. Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS E=mc2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. It is all CLEARLY proven !!!!!!!! TIME is NECESSARILY possible/potential AND actual IN BALANCE, AS E=MC2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/energy. GREAT !!!!!!!! BALANCE and completeness go hand in hand. By Frank DiMeglio

  • @SvenSon44
    @SvenSon44 4 ปีที่แล้ว +8

    I'm 30 and re applying to be accepted into a university engineering program. I'm going to take my university physics and math courses ! Math is awesome

  • @ChrisC-Pi
    @ChrisC-Pi 9 ปีที่แล้ว +70

    can you please add subtitles when someone in the lecture room asks a question, I can't hear what they are asking... would be really helpful... thanks

    • @JonathanMBardsley
      @JonathanMBardsley 5 ปีที่แล้ว +4

      This is an interesting read for you.
      We are in a matrix, that means there’s a hard drive to hold the data to our reality.
      Now through the experiment in showing water holds memory I believe I know where the hard drive is. In the experiment a listening device was used to record the electromagnetic field coming from the water to later reconstruct the DNA that was once in the water, this told me electromagnetic fields holds information so could earth magnetic field be the hard drive to our reality?
      I found my answer seeing magnetic frequencies shooting off SpaceX rockets at the earth magnetic field. CERN also was creating these magnetic frequencies, there’s footage of a big blue spiral over Norway. Now at the basics of our reality, it is the same as computer code in strings of ones and zeros, so theses frequencies are made from the powerful magnets being turned into a combination of positive and negative states and theses positive and negative states is the ones and zeros in computer code. Now the entire history of the earth right down to the positions of atoms is stored in the earth field, that is a hell of a lot of data so I don’t believe that there’s an infinite amount of parallel universes because there would need to be an infinite amount of storage. I believe there are other realms in the frequency domain, I believe Nibiru is in a different frequency range to us, I believe ghosts, spirits and even aliens are in the different frequency range to us but I don’t believe that there’s an infinite amount of parallel universes with an infinite number of me. In the flat earth, we are surrounded by water and I now believe the earth magnetic field is the waters above the magnetic field and I believe the data to our reality is held in the water. How water holds memory is the number of electrons to the number of protons in giving the positive and negative charge, and it’s the positive and negative change that acts like the ones and zeros, the magnetic frequencies are changing this data. If your wondering why people are having different memories to each other I believe it is where their memories are stored, if your memories are stored in earth magnetic field it’s going to change with the changes of earth magnetic field but if your memories are stored in your own magnetic field then they are going to stay the same. I’ve created a few videos showing what I say on my TH-cam channel if you fancy checking them

    • @dilloncurry9052
      @dilloncurry9052 4 ปีที่แล้ว +1

      Project D van right. I’m too high for this. Jesus Christ. .

  • @charliesinnott9840
    @charliesinnott9840 5 ปีที่แล้ว +7

    Forgive my lack of knowledge, seems the real question is: What is the inverse of "lambda must be less than X delta". No matter how finite one gets, the infinite remains both perspective and respectively. Now, I have yet to understand how diamonds and graphite exist and how density and lattice structure relate. Very interesting lecture.
    Thank you,
    Brett

  • @marksmith1119
    @marksmith1119 12 ปีที่แล้ว +42

    "Boiling water for a longer time makes it hotter"
    --GoodScienceForYou

    • @richardpark3054
      @richardpark3054 3 ปีที่แล้ว +2

      Turning the heat down on a tea-kettle of boiling water is a near-daily experience for me. And I live with people that I consider above average in intelligence.

    • @nmarbletoe8210
      @nmarbletoe8210 2 ปีที่แล้ว

      @@dustin741 Yes this is the principle on which a rice cooker works. When the water has become all vapor, the heat rises rapidly and the cooker turns off.

  • @rendog92
    @rendog92 14 ปีที่แล้ว +19

    Leonard is no ordinary man, such wisdom :)

  • @semb12
    @semb12 3 ปีที่แล้ว +1

    Amazing lecture - this guy must be the best physics lecturer I've ever come across.

    • @schmetterling4477
      @schmetterling4477 3 ปีที่แล้ว +1

      Pity you haven't seen really good ones.

  • @xBTWATWDx
    @xBTWATWDx 16 ปีที่แล้ว +3

    Quantum mechanics is so interesting. I just recently took quantum chemistry. I am more interested in organic though, which is my concentration. It is great to find lectures like this online.

  • @BoBBoFU
    @BoBBoFU 12 ปีที่แล้ว +2

    Also, QM can be used to describe/predict an enormous amount of phenomena which otherwise we have no explanation for, ranging from chemistry to electrodynamics. It also requires the knowledge of a lot of relatively advanced math (which requires LOGIC despite what you think).
    People who take math/physics/computer science classes not only learn the course material but learn problem-solving skills that are applicable no matter what job they end up having.

  • @anthonyar4
    @anthonyar4 3 ปีที่แล้ว +6

    It’s weird that I woke up one day with an understanding of this stuff without every being in a class, now I’m completely interested.

    • @blakehazen9857
      @blakehazen9857 3 ปีที่แล้ว +2

      "If you think you understand quantum mechanics, then you don't." -Richard Feynman

    • @noahappling1781
      @noahappling1781 2 ปีที่แล้ว

      Everything you can explain in very simple terms you can understand. Could you explain this in simple terms?

    • @anthonyar4
      @anthonyar4 2 ปีที่แล้ว

      @@noahappling1781 it would be easier to have a test on it lol. I haven’t watched this video in a year not saying I knew everything in video but a good portion.

  • @fredddsterrr5262
    @fredddsterrr5262 2 ปีที่แล้ว

    The internet offers so much more than meta, Twitter and funny videos.
    The internet is like an unimaginable huge library filled with things like this.
    Thank you :-)

  • @hellomate639
    @hellomate639 14 ปีที่แล้ว +16

    I wanna go to Stanford now so I can learn from Leonard Susskind! That's like learning to sing from Dean Martin.
    I wish I applied myself in high school like I am applying myself nowadays.

    • @Unknown-hp9nb
      @Unknown-hp9nb 3 ปีที่แล้ว +3

      Sup bro it’s been 11 years since u commented this that’s crazy

    • @hellomate639
      @hellomate639 3 ปีที่แล้ว +1

      @@Unknown-hp9nb Heh.
      I kind of remember making this comment.
      First semester, freshman physics... Lol. Oh, how naive I was then.

    • @Unknown-hp9nb
      @Unknown-hp9nb 3 ปีที่แล้ว

      @@hellomate639 how old r u now?

    • @hellomate639
      @hellomate639 3 ปีที่แล้ว

      @@Unknown-hp9nb 29

    • @YJRamone
      @YJRamone 3 ปีที่แล้ว

      @@hellomate639 did you continue to apply yourself? What are you doing these days? It sounded like you had “found yourself” when you wrote that

  • @archiedavis5365
    @archiedavis5365 ปีที่แล้ว

    Truly enjoying...
    Being in that 'older' category.... I recall the "Plumbing Physicist" and the man calling into reason the highly regarded Hawking and Uncle Albert .... and making his point.
    Thank you , sir, for your brilliance and your tenacity.

  • @chemistryworldwithdrvaneet6843
    @chemistryworldwithdrvaneet6843 3 ปีที่แล้ว +10

    Respected Sir, I learned a lot from your valuable lectures. Thanks

  • @SkynetT800
    @SkynetT800 6 ปีที่แล้ว

    Professor I am fascinated with quantum physics I'm 43 years old and the mumble-jumble is beginning to make sense thank you

  • @Ahebrew
    @Ahebrew 16 ปีที่แล้ว +3

    I live in Perú, these videos are helping me understand some subjects that are hard for me to understand because of the language barrier and that some of the terms I already know are different in Spanish then in English. Thanks for these videos, put more up.

    • @stevencuenca1980
      @stevencuenca1980 2 ปีที่แล้ว

      Thought I'd give you a like after over a decade...👍

    • @Castodre
      @Castodre 2 ปีที่แล้ว

      @@stevencuenca1980 same

  • @SprocketWatchclock
    @SprocketWatchclock 12 ปีที่แล้ว

    THIS is what the internet is for. THIS is the potential finallying being put to good use. Keep these comming!

    • @meet560
      @meet560 3 ปีที่แล้ว +1

      Seeing after 8 years

  • @kitkat2849-b3h
    @kitkat2849-b3h 3 ปีที่แล้ว +6

    hopefully i don't get any "are you single" ads on this video, i only have five minutes to study

  • @attunix
    @attunix 15 ปีที่แล้ว +2

    Most videos on TH-cam try to avoid mathematics, which makes them easier to understand and good introductory material, but you can't really talk about quantum physics without talking about abstract mathematics, including vector fields. Thanks for posting this.

    • @dylanharris1
      @dylanharris1 ปีที่แล้ว

      Oh, how predictable. Another pedant trying to sound smart by talking about the importance of mathematics in quantum physics. Newsflash, nobody cares.
      Sure, mathematics is important in quantum physics, but that doesn't mean you have to be a boring, pretentious bore about it. Maybe if you spent less time obsessing over abstract concepts and more time actually communicating with other human beings, you'd realize that.
      But I guess that's too much to ask from someone like you. So go ahead, keep prattling on about vector fields and abstract mathematics. Just don't be surprised if people drop dead from boredom in your presence. Or maybe I'll have to take matters into my own hands and make sure you're never able to bore anyone with your pedantic lectures ever again.

  • @alimtimm7355
    @alimtimm7355 2 ปีที่แล้ว +4

    Teacher: “are you under 40”
    *Me who’s 17 watching this before I go out train surfing*

  • @thethinkingbeing9817
    @thethinkingbeing9817 5 ปีที่แล้ว +1

    7:45 Here, here’s where we get to the good stuff. If you didn’t take GCSE physics and got at least a 6, don’t bother skipping to this part.

  • @freshgasflow
    @freshgasflow 16 ปีที่แล้ว +8

    Thank you very much for sharing your wonderful lecture with us !

  • @FrostdPoptart
    @FrostdPoptart 16 ปีที่แล้ว +1

    You can measure an instantaneous velocity (think police radar, measures instantaneous speed using the doppler effect). You cannot measure both the instantaneous velocity and the exact position of the particle when you measure that velocity, though.
    The Heisenberg U.P.'s minimum uncertainty (hbar / 2) is far too small to notice on our macroscopic level though.

  • @markwhitaker574
    @markwhitaker574 4 ปีที่แล้ว +28

    I watch this when I have trouble falling asleep

    • @kotieboatz6042
      @kotieboatz6042 4 ปีที่แล้ว +1

      Same haha I thought what is interesting but boring

    • @brianmedina8917
      @brianmedina8917 4 ปีที่แล้ว +1

      same

    • @stevepoper8073
      @stevepoper8073 4 ปีที่แล้ว +1

      Wait woah is that bad sign, does this mean I don't think quantum physics is intersting?

  • @lxghtslmao
    @lxghtslmao 2 ปีที่แล้ว +1

    is it weird that im 13 and searched for this. also thank u to the professor he does a surreal job of explaining this to the point where i could understand.

    • @schmetterling4477
      @schmetterling4477 2 ปีที่แล้ว

      So what make you become a bullshitter? ;-)

  • @anteman7087
    @anteman7087 8 ปีที่แล้ว +16

    An excellent lecture!!!!Keep it going on Dr.

  • @Dobiegal
    @Dobiegal 3 ปีที่แล้ว

    I use these lectures to be lulled to sleep. Works like a charm...

  • @PhysicsPlayground
    @PhysicsPlayground 8 ปีที่แล้ว +2

    To make a warp bubble we need to push on space and get it to move. It seems like a particle accelerator pushing atoms near the speed of light it the perfect tool to get space to move. Has anyone ever tried to measure the effects of a particle accelerator on the vacumme? Can we push on the vacuume with a partical accelerator?

    • @quimlast7180
      @quimlast7180 8 ปีที่แล้ว

      What would the particle accelerator be pushing on..?

    • @robbyandrews6318
      @robbyandrews6318 5 ปีที่แล้ว

      WELL, #1 YOU NEED TO ASK THE RIGHT QUESTION. WHAT PARTICLE ARE YOU SPEAKING OF? PROTON, NEUTRON, FROM WHAT ELEMENT? PLEASE.I NEED TO KNOW BEFORE SOME1 CAN ANSWER THAT QUESTION. YOU THINK? THAT TABLE IT CAN BE VERY TRICKY.

  • @keepsecret7624
    @keepsecret7624 6 ปีที่แล้ว +2

    I am from Europe and we do know damn well what continuing education means. I will do these courses and see how it develops

    • @mrwess1927
      @mrwess1927 2 ปีที่แล้ว +1

      How’d it go?

  • @Entropy3ko
    @Entropy3ko 15 ปีที่แล้ว +4

    This is also Lecture 1, very basic and introductory. It gets, of course, more complex later on :)

  • @muckrak3r
    @muckrak3r 4 ปีที่แล้ว

    I'm an enlightened individual (self proclaimed) with multiple degrees and I'm a working high level engineer. And this guy, I know he's epic in the world of quantum physics... But there's entire sections where his examples are basically nonsense. Mainly because he's omitting crucial explanatory information. The '3 sided coin' for example. I mean, dammit man. He instantly goes into 'reversing the laws of physics' (and don't get me started on how he's not even mentioned probability in this at all which is crazy) with no background discussion on what he's talking about. Maybe he discussed some of this in past courses but holy balls it's frustrating. But thank you Stanford for sharing this and I'll inevitably stay tuned for the entire series because I know this man is a physics legend.

  • @chshkt
    @chshkt 14 ปีที่แล้ว +8

    Thank you Stanford, keep up the good work!

  • @aeroscience9834
    @aeroscience9834 6 ปีที่แล้ว

    Vector spaces are also sets... they also have additional sets paired with it (or maps) that give it extra structure (the addition and scalar multiplication).

    • @aeroscience9834
      @aeroscience9834 6 ปีที่แล้ว

      What a set actually is is what I think susskind is trying to use the word 'collection' for.

  • @brandongetter8210
    @brandongetter8210 8 ปีที่แล้ว +140

    this guy looks and sounds like Mike from breaking bad

    • @galantiaxgaming6
      @galantiaxgaming6 8 ปีที่แล้ว +7

      not even close

    • @brandongetter8210
      @brandongetter8210 7 ปีที่แล้ว +5

      Mark Martin lol

    • @kelumabhayawickrama
      @kelumabhayawickrama 7 ปีที่แล้ว +10

      And he also talks about Heisenberg!

    • @rocksparadox
      @rocksparadox 7 ปีที่แล้ว

      mrbg 12
      So a ''small bald guy looks like a taller bald guy'' ?
      *McDonalds, pewdiecancer and onisionbitch have FUCKED YOU UP SON*
      Get glasses.

    • @zhll6529
      @zhll6529 7 ปีที่แล้ว

      hahah

  • @buttegowda
    @buttegowda 6 ปีที่แล้ว

    At 1:50, why random direction ? Momentum being a vector, laws of vector ( like law of parallelogram of forces) can tell exactly which direction and momentum the electron will go after collision ?

  • @kzterminator
    @kzterminator 11 ปีที่แล้ว +3

    When I hit the 'Complete playlist for the course' the list of CLASSICAL MECHANICIS pops out. o.O

  • @BoBBoFU
    @BoBBoFU 12 ปีที่แล้ว

    The proper equation is E^2 = m^2c^4 + p^2c^2 for a particle that may be in motion relative to your rest frame, where p is the momentum. Thus, as you observe the particle to travel faster, you must also observe the particle as having more energy, but the mass is still the same. You're confusing rest mass with "relativistic mass" which is not really the mass at all, and it's a concept many physicists argue about doing away with due to the fact that it misleads many people to think what you think

  • @dazzledchapsticks
    @dazzledchapsticks 3 ปีที่แล้ว +7

    The begula Effect

  • @thomasmann3209
    @thomasmann3209 12 ปีที่แล้ว

    This is a very intelligent person discussing very important things,WHY would people use profanities and/or say ridiculous things when posting comments?

  • @taisgdl
    @taisgdl 10 ปีที่แล้ว +33

    Where did we get the idea that watching this would make me smarter?

    • @Jipzorowns
      @Jipzorowns 10 ปีที่แล้ว +6

      I wish I knew more of these people in my daily life.

    • @hjembrentkent6181
      @hjembrentkent6181 9 ปีที่แล้ว +15

      Watching Susskind videos definately makes you smarter. He is the great teacher. His thoughts about physics are refined and clear. I dare you to not learn anything

    • @chanakyasinha8046
      @chanakyasinha8046 6 ปีที่แล้ว

      Discovering is human nature, if you find answer to something which was questioning you inside. 😀

  • @awesomeankit1556
    @awesomeankit1556 3 ปีที่แล้ว +2

    First lecture on my dream subject "Quantum Physics"🤗

  • @angelatzw1503
    @angelatzw1503 8 ปีที่แล้ว +25

    Mike Ehrmantraut?

  • @andreasfoerster772
    @andreasfoerster772 12 ปีที่แล้ว

    Time is not constant, through trajectory along an axis in a distinct direction time is not stagnant for it is carried with cette momentum. Therefore it varies in measure by scale of distance, force, velocity and these all affect different quantities of time traveling along that axis. Time can't stay constant, it varies through certain implications upon other forces which affect it or anything else.

  • @jamesbentonticer4706
    @jamesbentonticer4706 10 ปีที่แล้ว +101

    They should hand out cough drops before these things start.

    • @AndreaArturoGiuseppeGrossi
      @AndreaArturoGiuseppeGrossi 6 ปีที่แล้ว +2

      LOL! Yeah, you are so right! :-)

    • @JonathanMBardsley
      @JonathanMBardsley 5 ปีที่แล้ว +4

      This is an interesting read for you.
      We are in a matrix, that means there’s a hard drive to hold the data to our reality.
      Now through the experiment in showing water holds memory I believe I know where the hard drive is. In the experiment a listening device was used to record the electromagnetic field coming from the water to later reconstruct the DNA that was once in the water, this told me electromagnetic fields holds information so could earth magnetic field be the hard drive to our reality?
      I found my answer seeing magnetic frequencies shooting off SpaceX rockets at the earth magnetic field. CERN also was creating these magnetic frequencies, there’s footage of a big blue spiral over Norway. Now at the basics of our reality, it is the same as computer code in strings of ones and zeros, so theses frequencies are made from the powerful magnets being turned into a combination of positive and negative states and theses positive and negative states is the ones and zeros in computer code. Now the entire history of the earth right down to the positions of atoms is stored in the earth field, that is a hell of a lot of data so I don’t believe that there’s an infinite amount of parallel universes because there would need to be an infinite amount of storage. I believe there are other realms in the frequency domain, I believe Nibiru is in a different frequency range to us, I believe ghosts, spirits and even aliens are in the different frequency range to us but I don’t believe that there’s an infinite amount of parallel universes with an infinite number of me. In the flat earth, we are surrounded by water and I now believe the earth magnetic field is the waters above the magnetic field and I believe the data to our reality is held in the water. How water holds memory is the number of electrons to the number of protons in giving the positive and negative charge, and it’s the positive and negative change that acts like the ones and zeros, the magnetic frequencies are changing this data. If your wondering why people are having different memories to each other I believe it is where their memories are stored, if your memories are stored in earth magnetic field it’s going to change with the changes of earth magnetic field but if your memories are stored in your own magnetic field then they are going to stay the same. I’ve created a few videos showing what I say on my TH-cam channel if you fancy checking them

    • @windjammer3950
      @windjammer3950 5 ปีที่แล้ว +1

      Mandela Effect Jonathan Bardsley what the fuck does that have to do with a cough drop 😂😂

    • @thethinkingbeing9817
      @thethinkingbeing9817 5 ปีที่แล้ว +1

      Yeh it’s funny how University students are actually terrible at looking after themselves. I’m not even kidding man; my sister used to get a cold every 2 weeks or so.

  • @lupi2000
    @lupi2000 14 ปีที่แล้ว +2

    Grazie prof. Susskind, le sue lezioni sono eccezionali, grazie all'università di Stanford.... (Thank you, prof. Susskind, your lessons are exceptional. Thanks to Stanford University too) ...Luigi from Italy

  • @gaWgaMes
    @gaWgaMes 11 ปีที่แล้ว +6

    Awesome class, thank you so much for this

  • @judeuys577
    @judeuys577 2 ปีที่แล้ว +2

    I am only 14 years old and I love this stuff

  • @mkminerals12343
    @mkminerals12343 9 ปีที่แล้ว +34

    Leonard susskind is an excellent teacher but quantum is a field you have to study like you yourself is a discoverer.

    • @RUMPELSTILTSKY
      @RUMPELSTILTSKY 9 ปีที่แล้ว +6

      well said

    • @tachyonX370
      @tachyonX370 7 ปีที่แล้ว +2

      Discover is quite an inappropriate word in your logic

  • @skymonk-mckenzie6792
    @skymonk-mckenzie6792 2 ปีที่แล้ว +1

    I am some random 15 year old who just watched nearly 2 hours of a guy discussing something I don’t understand at midnight, and boy, is this time well spent.

    • @mpx_primusx2044
      @mpx_primusx2044 2 ปีที่แล้ว

      Don’t worry, when you hit senior year you’ll understand every bit of it

    • @UnknownUser-qf2xz
      @UnknownUser-qf2xz 2 ปีที่แล้ว

      lol im also a random 15 yo old but the difference is i understand 40 - 50% of it

  • @Touchpadse
    @Touchpadse 11 ปีที่แล้ว +11

    great lecture, really interesting and well taught!

  • @buttegowda
    @buttegowda 6 ปีที่แล้ว

    At 42:00 on words, why do we believe that once we do 'measurement' the particle we see after words is the same as the one which left the gun ? As I understand, if the particle is somehow 'recorded' as it enters the slit A or B, that means that the photon was absorbed by the 'gas' or the apparatus and what comes out is the particle/proton released after the reaction, ... meaning the particle which left the gun is dead ... as long as we do not measure, the particle is alive and we get the expected classical behavior ... we cannot expect classical behavior once the particle is 'dead' and what we are looking at two different particles ?? - I might be dumb in thinking like this ??

  • @digvijaysenapaty3990
    @digvijaysenapaty3990 3 ปีที่แล้ว +11

    Im here after beluga to check dislikes

    • @exyro
      @exyro 3 ปีที่แล้ว +4

      same lol

    • @Raarya-wc4vc
      @Raarya-wc4vc 3 ปีที่แล้ว +3

      don't dislike it

    • @kirtu9035
      @kirtu9035 3 ปีที่แล้ว +2

      same, disappointed.

    • @ItzzFinnix
      @ItzzFinnix 3 ปีที่แล้ว +1

      @@Raarya-wc4vc yeah same

    • @Raarya-wc4vc
      @Raarya-wc4vc 3 ปีที่แล้ว

      Nothing will happen now cuz dislikes are gone

  • @newresearchofsciencenewres4452
    @newresearchofsciencenewres4452 6 ปีที่แล้ว +2

    New photon theory
    Number of kinetic photon
    P=ETC2
    New equation of kinetic photon partical

  • @marcusfrost1548
    @marcusfrost1548 5 ปีที่แล้ว +8

    Who’s here in high school and watching for fun

  • @vanessamichaels9512
    @vanessamichaels9512 3 ปีที่แล้ว +1

    I studied math in college but always had a bit of a block when it came to physics. The teacher made it really accessible for someone like me. Not sure how this would pan out for most, though?

    • @malikramadan961
      @malikramadan961 3 ปีที่แล้ว

      Here after 13 years

    • @lepidoptera9337
      @lepidoptera9337 3 ปีที่แล้ว +1

      The only physics courses worth going to in college\university are those for physicists. Forget about "Physics 101 for x", where x is in {engineers, mathematicians, chemists, egyptologists, dentists, podiatrists, pre-school teachers,...}. I had desperate students from other faculties come to me because they couldn't understand the material. They showed it to me... and I couldn't understand it THAT WAY, either. Physics can not be abbreviated. There is a reason why physicists take an entire semester just for something fairly straight forward like classical mechanics... and in reality it would have to be two to get to any substantial level. So, yeah, it's not "you". It's the way they are trying to teach it to you.

  • @iliyanparin_iitism
    @iliyanparin_iitism 4 ปีที่แล้ว +3

    Hey you there, but why are you watching this at midnight??

  • @GoodScienceForYou
    @GoodScienceForYou 12 ปีที่แล้ว

    From the single starting point in space all bodies are accelerating; moving outward, gaining in mass & density. Time is speeding up and decay rates are slowing down relative to "objective time", which has no time, actually (difficult for humans to understand). The center of each galaxie is held together by a black hole. It is the mass of this original body that is now long long ago what we are seeing, was the force that pulled the galaxies together for form galaxies after the initial impulse.

  • @chockypompom
    @chockypompom 2 ปีที่แล้ว +2

    Don't look at him. Just listen. Before you know it, it sounds like I'm being taught quantum physics by Peter Griffin from Famiky Guy. Now I can't unhear it. Gigidy.

  • @ludachristo
    @ludachristo 14 ปีที่แล้ว +1

    I dont know how you can reverse the magnetics and assume it is the same as reversing time exactly. I believe the magnetic fluctuation while reversing the magnatism would effect the atom.

  • @kennyparker5847
    @kennyparker5847 4 ปีที่แล้ว +3

    So nostalgic though never watched it after 5mins 🤣🤣🤣

  • @PhysicsPlayground
    @PhysicsPlayground 4 ปีที่แล้ว +1

    is the reason E=mc^2 because all mass is due to motion?

  • @Gearhe1d
    @Gearhe1d 15 ปีที่แล้ว +5

    If I may respond, MIT uploads amazing videos as well.

  • @Dyslexic-Artist-Theory-on-Time
    @Dyslexic-Artist-Theory-on-Time 14 ปีที่แล้ว

    Could Heisenberg Uncertainty Principle be the same uncertainty that the observer will have with any future event? Could time and the geometry of spacetime be continuously formed by the momentum of EMR or light form one atom to another? There is no understanding of time in modern physics or why we have a future and a past. Could this be why we have the paradoxes of QM?

  • @paulwary
    @paulwary 7 ปีที่แล้ว +7

    Quantum physics at 80! Maybe they're hoping to recognise and navigate the quantum vacuum when their mortal coils are de-energised.

  • @jimbojonesmgr
    @jimbojonesmgr 2 ปีที่แล้ว

    Long before TH-cam there was the infamous Stanford Correspondent courses. Many professors were passing knowledg on to those who could not attend by USPS mail. Invaluable to those who were in service abroad.

  • @calebtot
    @calebtot 10 ปีที่แล้ว +15

    Really Stanford? You can't do any better than 240p? Great content though. I really like this professor.

  • @jacobleitz3839
    @jacobleitz3839 6 ปีที่แล้ว +1

    In Algebra ll, we are learning about r×sin(9a) and When you stated the term of the period being lambda, which would be 9 in this case.
    What would the r in this case for the wave length equations?

  • @karimshah77
    @karimshah77 7 ปีที่แล้ว +17

    that was hell of crack joke at t: 4:08:

    • @lukeleighton3872
      @lukeleighton3872 6 ปีที่แล้ว +1

      karim shah I shat myself laughing. :/

  • @erictotten6753
    @erictotten6753 11 ปีที่แล้ว

    I congratulate you on your ability to disregard the first thing the professor said in this video.

  • @sherlockholmeslives.1605
    @sherlockholmeslives.1605 6 ปีที่แล้ว +5

    I wish I could swap the understanding of this for all the things I do know.

  • @danielash1704
    @danielash1704 2 ปีที่แล้ว

    At 55 i worked on piston based plasmas it is touchy subject to the experiencer. Love compassion for all Daniel Ash

  • @michaelkuhel945
    @michaelkuhel945 8 ปีที่แล้ว +5

    Just play a game of uno and this will all make sense.

    • @MetalKabu
      @MetalKabu 8 ปีที่แล้ว +1

      +Carlton Banks dunkey, is it you?

    • @robbyandrews6318
      @robbyandrews6318 5 ปีที่แล้ว +1

      IS THAT SPANISH. I CANT SPELL THAT. PLEASE PUT THAT ENGLISH

  • @kevinireland8020
    @kevinireland8020 2 ปีที่แล้ว

    Am I missing something? Are the terms electron and photon being used interchangeably? It was professors like this fellow that made me thankful I could learn straight out of text books.

    • @chrismathis4162
      @chrismathis4162 2 ปีที่แล้ว

      Wow, whether it’s an electron or photon is immaterial to what he’s talking about. It’s a small particle that’s important. So in that sense they are interchangeable. If he were talking about let’s say electrical charge then it would make a difference, but for the double slit experiment it makes no difference, they are both small quantum particles. You are missing the point entirely.

  • @samad9884
    @samad9884 3 ปีที่แล้ว +6

    Bulega 😐

  • @ikarienator
    @ikarienator 11 ปีที่แล้ว +1

    Photon has no "invariant mass", which means all the mass it has comes from the energy it carries. Momentum is defined as mv only in Newtonic classical physics. Not even in other parts of classical physics.

  • @BoBBoFU
    @BoBBoFU 12 ปีที่แล้ว +5

    "Frickin' magnets, how do they work?"
    -GoodScienceForYou

  • @brainstormingsharing1309
    @brainstormingsharing1309 4 ปีที่แล้ว +2

    Absolutely well done and definitely keep it up!!! 👍👍👍👍👍

  • @coffle1
    @coffle1 9 ปีที่แล้ว +22

    How strong does my physics background have to be to understand this? I want to kmow before potentially wasting my time watching the video lol. And are all these pretentious kids bragging about their age annoying anyone else?lmao

    • @biohoo22
      @biohoo22 9 ปีที่แล้ว +3

      ranvideogamer To your last comment: yes. How strong does your physics background have to be? I would say that's irrelevant as you can always write down any questions you have and use TH-cam to answer them as they come up. Have fun with this!

    • @quadhd1121
      @quadhd1121 9 ปีที่แล้ว +1

      it depends on how strong your brain is, I recommended you have to be 19 and above with strong knowledge of maths

    • @angelgjr1999
      @angelgjr1999 9 ปีที่แล้ว +1

      +ranvideogamer I take honors chemistry in my high school. And I understand some of this. Quantum physics is like the study of randomness, and universal atomic patterns. It is interesting stuff.

    • @angelgjr1999
      @angelgjr1999 9 ปีที่แล้ว

      +ranvideogamer I think it also teaches you about what happens in a nuclear reaction. He talks about Photon particle guns, which is how atomic bombs are made.

    • @DeathInTheMusic
      @DeathInTheMusic 9 ปีที่แล้ว

      +Jonathan Biohoo What an excellent answer! I agree with your approach.

  • @mathveeresh168
    @mathveeresh168 5 ปีที่แล้ว

    Uncertainty has nothing to do with measurement. The idea he explained is very easy to understand but it's not the real meaning of uncertainty principle, but great lecture from this man