I remember as a child I broke a calculator and discovered that its LCD digits can only be viewed by a thin plastic film cover. For years I kept wondering how much of this world is hidden behind films like that.
could be a reason some can't see the things, some people call ghosts. some people can see them, some can't. Interesting thought. Maybe also, some people say the typical grey alien description, with the big eyes, aren't eyes at all, but, lens coverings for an eye behind that. Maybe they help them see things like this, that would otherwise be invisible, that would be interesting. Possibly why they say pets react to & can see spirits too.
@@matthewwriter9539 rabbits have interesting digestive systems. It requires them to eat near constantly, because if the guts stop moving they can get a blockage and die.
We did this in polymer engineering class, and I always thought it so cool. Years later, I gave my operators polarized safety glasses so they could see certain defects in tempered, parabolic segments of glass. It worked too well! They saw everything and started rejecting stuff that was in-specification, lol.
J'aime beaucoup ton accent et le contenu ! Ça fait plaisir de voir deux de mes youtubeurs préférés dans une même vidéo. J'espère que cette vidéo pourra t'apporter des abonnés car ton contenu est vraiment génial.
I accidentally stumbled on this effect many years ago while driving a Volkswagen Beetle. I looked into the centre rear-view mirror and was shocked to find that the rear window had crazy rainbow-coloured blotches all over it. However, when I took my polarized sunglasses off, the effect disappeared. I later learned that it was a bad idea to wear polarized sunglasses whilst in the cockpit of a plane, because the same effect can occur with an acrylic windscreen, severely hampering a pilot's visibility and creating an unsafe condition.
@@brianwright9514 they see all the same horizontal surfaces and more, including glints off of other aircraft which are very important not to miss... so they can be missed.
I found out about the LCD sheets and what they can do, by myself, when I was a little kid in the '90s, by disassembling and reassembling a Gameboy. It blew my mind! I got the polarized sheets from the front and back of the display and made a pair of glasses with a frame of paper cut out. People would see me wearing that ridiculous thing while playing with a Gameboy that was clearly broken ('cuz they couldn't see any images, only hear the noises) and they would think I was a little odd. But when I showed them how I could see the game through the glasses - then they were sure that I was indeed really odd. One cool thing not mentioned in this video is that if you put the sheets against the transparent screen and press a point with your thumbs it creates a quick colorful wave around that point. 𝑻𝒓𝒊𝒑𝒑𝒚. ☼‿☼
@@Hysube I don't see it in most plastics, but occasionally I do. I always just assumed that those plastics were different, but the effect is so faint I hardly ever notice it and don't point it out to people
TH-cam has ALWAYS grayed the screen out when paused for me, across 3 PCs and 3 phones totally 4 operating systems and 3 web browsers. It's impossible to even do the thing they are asking you to do, it's like this video was made by 14 year olds.
@@anarchyantz1564 Duct tape is over rated. Except on lips- don't let it touch the inner part of your lips. I tried using duct tape to remove hair from my leg once, and it didn't work.
I found this out by accident while wearing RealD 3D movie theatre glasses at home once and eating a freezie (one of those frozen tubes of flavoured juice that you give to kids, if you don't know) and I looked at the clear packaging through the glass with my monitor in the background and it blew my mind. I spent like 20 minutes just rotating it and trying out different pieces of plastic and I was firmly mesmerized. I looked up some explanations online, but this video is one of my favourites. Awesome content.
I tried moving closer to the screen and realized that the yellow blobs became much smaller. Then I moved a few feet back and the yellow blobs were now much larger. You don't need to look only in the middle of the screen. The polarized light blobs can be seen anywhere on the screen. Wherever you look, they appear. Just tip your head and they move back and forth! I now feel confident that I can travel with the migrating birds and sea turtles. Thanks Dianna.
Hmm, nope, didn't work for me. I wonder what percentage of humans can see it. Edit: now actually I do see some yellow - for me it helps to tilt the laptop rather than my head.
Personally, this video resonated with me very well; maybe you're just not on the right wavelength my friend... if you just open your eyes, I'm sure you'll see the light.
IceMetalPunk I'm glad to see you here too, Physics Girl is great! Fun topics and demonstrations. SciShow has a regular upload schedule, so it's easier to pun around there :)
Pixel_Vengeur Bruce déçoit un peu depuis un an, Léo propose tellement de qualité de mieux en mieux en plus ! Mais on a de bons scientifiques sur le youtube FR
Je ne suis pas de cet avis, mais je le respecte. Y'a un truc chez Bruce que je ne parviens pas à m'expliquer, et que je trouve que Léo n'a pas, peut-êter un cynisme ou l'autre, je ne sais pas.
Something really interesting, not mentioned in the video: the yellow-blue Heidinger brush also is visible in nature at the sky. It stands perpendicular to the sun, best visible for a brief period of time during sunrise and dawn.
Je pense je parler tres mauvais francais mais j'essayer un peux sans google translateur :p voila je "hope" je dire un "sentence" correct en francais :p
@@The-Cat not bad at all, the correct sentence is : "Je pense que je parle très mal le français mais j'essaie un peu sans Google Traduction :p Voilà j'espère que j'ai dis une phrase correcte en Français"
ok I feel this wasn't explained clearly enough so let me explain: 1. The first polarized film filters the light so they all have the same polarization/direction. 2. The tape then refracts the light differently depending on wavelength/colour, but since they all started out in the same direction all light of the same colour is now twisted the same way. 3. Finally, the second polarizing filter now sorts out the light of one particular direction and since we determined that a particular colour now have a particular orientation, it's going to let through a certain colour. It's the nanoscopic air-gap that refracts the colours, just like oil on water but since the distance is not perfect and they used more than one layer you will see other colours as well that will have the same orientation but be of a different colour.
You can train yourself to see quite a range of things. It's similar to the Tetris effect. With a few exceptions, anything you make your brain do for long enough will eventually become fairly automatic.
@@klemmichard8916 How awful ! Could anyone strongly encourage english speaker youtubers to make them videos subtitled in English so we can translate them ?
I keep watching your videos over and over again, everytime they pop up in my TH-cam homepage, because every second of each video, I'm sending positive energies for your prompt recovery Diana. We love you, and with all our hearts, we keep wishing for you to get better! 💖
One of the coolest part is having 2 polarized filters so that nothing passes through... and then adding 3rd filter between them and all of them become transparent once again!
iau Say filter 1 is vertical, all light coming through it is now vertically polarized. Filter 2 is 45-degrees diagonal. Equal portions of the light is either let through or blocked (vertical light can be broken up into 2 diagonal components). Filter 3 is horizontal. Once again, equal portions of the light coming through the diagonal filter is either let through or blocked (diagonally-polarized light can be broken up into vertical and horizontal components). So you basically use the middle diagonal filter to "rotate" some of the light so that it can then pass through the horizontal filter. Edit: Keep in mind, vertical and horizontal are relative to your reference frame which is arbitrary. Nothing is inherently _vertical_ or _horizontal,_ it's more about measuring perpendicularity. A photon that is polarized perpendicular to its filter won't pass through. Otherwise, it has a _chance_ of passing through.
Its because the light only cares about the difference between both filters. The equation is cos^2(theta), theta being the angle between both filters. So if you have the two filters at 90deg from each other, then it gives you 0% light exiting. If you have a middle filter then you have 45deg from first to second which gives you 50%, then second filter to the last gives you 50% again, which is ends up with 25% light at the end.
Diana, your enthusiasm and child-like delight at all things physicsy always put a smile on my grumpy old face. Your channel is worth more than you realize.
And more! there are colours you see/experience/feel/smell while tripping on psychedelics like Psilocybin or LSD that just don't exist outside of a trip.
I hope you get well. It breaks my heart to hear of what you're going through. I absolutely love your content, and love your energy. I wish wellness for many years for you and your husband.
Just FYI to everyone, the sheets are pretty cheap on amazon. Make sure to check the reviews though. Some are sold alone, some in packs. Some are 6in x 6in, some are 3x3.
KevinMcNoodles If you don’t wanna w8 in the mail you can salvage old laptop screen from their filters with a good cutter and a steady hand. There’s a tutor on Instructable
Another weird thing about polarization is that as you add more layers of the "tape", it actually can let MORE light through than fewer layers. It can get VERY weird and unintuitive.
Wow, as a French viewer, I wasn't ready to see Leo from Dirty Biology. Thanks to share other channels than English languaged ones. Great video by the way
Cool content! A few years old and still interesting. Hey, in photography we use circular and linear pole filters for lenses - mostly, to eliminate reflections (water surfaces, windows, and so on), but also as tool to enhance the color contrast. (λ/2 - λ/4)
Only only some have color blindness, some humans have faster reflexes than others, only some people are blonde. We are all individuals with different properties.
I know words, I have the best words. Nobody respects women more than me. I am the least racist person who you have ever met. Nobody lies better than me. Believe me. Sad!
I will now refer to my favourite Science TH-cam as Harry Potter Characters: Michael from VSauce would be Neville, cause he can carry this on its own Myth Busters would be Fred and George, always screwing around Mark Rober would be Charly, he worked with fire breathing things Kyle from Because Science would be Bill, cause he's hot MattPatt would be Luna, I blame the nargles Neil DeGrasse Tyson would be Lee Jordan, the Radio host and Carl Sagan is Dumbledore, cause he's the OG
Anyone ever noticed the stress areas on some car tempered glass windows? normally I see them as a grid of circles from where the flame heads heated the glass during manufacture. They get darker and lighter inversely somewhat when tilting you head.
Yeah whenever I drive with polarizing sun glasses it gets so strong that I have to not try to look at all the different patterns of all the different cars on the road.
If you have a 33.3 rpm record, put two strips of adhesive tape radially (center to edge) across the tracks and press them into the grooves so the adhesive copies the grooves. You now have two polarizing lenses. Put one on a piece of acrylic, the 2nd on another and experiment. The lines in the adhesive will act as polarizers.
Dianna, you're amazing!!!! So much energy and enthusiasm. You are without a doubt my favorite TH-cam-er! You're simply the best, better than all the rest!
Want to *really* blow your mind? Put two polarizers at 90 degrees to each other, so all light is blocked... Then insert a 3rd polarizer between the two -- and you'll see the light coming through again!! 'Splain how three polarizers block *less* light than two polarizers!! Go Google that one -- it's a really cool explanation.
Mariano Ntrougkas but the point is that it’s so counterintuitive! From face value it seems non sensical. The 2 initial filters block all incoming light. So adding on in between shouldn’t change the outcome...or so it seems
@@Riiisuu I think it's counterintuitive because most people would expect the 3rd filter to be added to the end (after the light has been "cancelled"). If you put it in the middle, it would probably interfere with the cancellation, so then it's unsurprising.
@@Riiisuu I hope most people would not have thought that. If you think you can increase the blocked light past 100%, I want what you're smoking. Would be sick. "Buy a Flashdark today!"
Et elle parlera en français ? (si c'est le cas, je suis pour, à 101%. À 101% parce que je suis à 100% pour si elle ne parle pas en français, mais ce serait encore mieux si elle le faisait, donc il faut augmenter un peu)
Like any self-respecting 20-something, my phone has a crack in the screen. I put a piece of really clear shipping tape on it it prevent the crack from spreading. Imagine my surprise when I looked at it with my polarized sunglasses on and saw this effect!
I'm impressed that they got through this whole video without saying "wavelength" or mentioning the electromagnetic spectrum. At least I learned kind of what polarization is.
When I tilt my head very fast counter-clockwise, I get horizontal yellow dots, when I tilt my head very fast clockwise, I get vertical yellow dots. Now I feel dizzy.
At first I just smiled at your "fast to dizzy" comment. But with unknown reason I followed it, and then I saw the yellowish dots! When I followed the "tilt slowly" instruction, I didn't notice the yellowish dots. Now I can see it. Thanks. :-)
I see it! I thought I was imagining it because it was so faint, but it looked exactly like they described! Also, I've always wondered WTF was going on with 3D glasses, now I know.
@@animeloveer97 modern 3d glasses are polarized. One side is vertical and the other is horizontal, so one eye is only seeing half of the two slightly parallaxed 3d images. Some IMAX screen used circularly polarized light and one lens is clockwise and the other is counter clockwise, It creates a less perceived flicker in 3D films.
Is being able to see polarized light rare? I've always liked just looking at things until I got the slight eye burn in and then blinking, the polarized light is really visible if you do that.
Thank you for keeping the white polarized image on on the screen TWICE for about TWO SECONDS EACH. That's certainly enough time to examine if I can see some faint unknown pattern that shows up only when i repeatedly tilt my head slowly from side to side...
Fun fact: the Vikings used a "birefringent crystal" for navigation in high latitudes, where magnetic compasses are unreliable. The crystal could tell the navigator which direction the sun was even in an overcast sky.
I know words, I have the best words. Nobody respects women more than me. I am the least racist person who you have ever met. Nobody lies better than me. Believe me. Sad!
Oh, vocal cords, I couldn't help it. Is it even possible to not laugh at that string of nonsense? We never knew it at the time, but that's why the 'LOLWUT?' meme was created so long ago.
Omg thank you ! I've always wondered how the polarized lenses you put on the microscope to examine rocks works ! (D'ailleurs Léo c'est quoi cet accent anglais ?? :p)
The refraction of light is related to the dielectric constant it's awesome for doing 3D art , along with using horizontal and vertical lines of contrasting colors. This brought back a memory of a old art project .
You said that some humans can see polarized light. All humans that are not blind can see polarized light. Most can not detect which type of polarization it is. I know what you mean, but it would be better to have said that only a few humans can detect differences in polarized light, not that they can "see" polarized light. I'm being picky, I know. I love your work.
I thought I was crazy for thinking this! I noticed that the sunshine reflecting off of rivers that are high in tannic acid from the leaves (blackwater river) was bright violet under polarized sunglasses. Yet I noticed I could still perceive the color although much less obviously so. It was the kind of thing you wouldn't notice unless you were specifically looking for it. The same thing happens although to a lesser extent with a blue sheen to freshly paved asphalt.
Crossed polarized sheets. I use that all the time when analyzing minerals. Take a look at pics of thin section slides of rocks taken with crossed polars. Some are gorgeous, most are interesting and unexpected.
nobody: my adhd brain: delightfully stares at the rainbow patterns in clear spoons anytime i’m at a dinner party… realizing now that nobody else sees it & i’ve looked like a crazy person for years
Something interesting to note is that most wireless routers (anything better than the cheapest ones) send and receive radio waves at different polarizations to encode more information into the same bandwidth. Going from one to two nearly doubles the bandwidth, while going even higher only gives incremental improvements since there can be only two polarizations that are orthogonal to each other. (That's why with a router that has external antennas, it's recommended to position the two outer antennas at 90 degrees from each other.) A good visual analogy would be two projectors with orthogonal polarizations playing different videos at the same screen. Look at it directly and you only see a mix of the two videos, but look through a polarizer and by adjusting the angle, you can see just one or the other. (That is how some 3D display systems work.)
True for some models, but other models with multiple antennas are designed to have all antennas in parallel. Some of the advanced ones rely on other techniques for maximizing signal strength. Check what applies to your specific WiFi router or access point.
I have a cheap Netgear AP that looks like it's polarization domain multiplexed from the outside, but take it apart and it becomes evident that it actually uses each antenna for a different band. It is, however, far less common than most modern routers which do take advantage of polarization domain multiplexing. On a side note, because there are only two fully orthogonal polarizations, if you have a router with 3 or more antennas, it makes sense to think in 3D when orienting the antennas, trying to make sure any device in the space of interest would get a good signal from at least two of the antennas.
Get 3 of these polarised sheets and hold one vertically and the next one behind it at 45°, then a 3rd horizontal. If you love maths and physics then this should blow your mind.
you could probably calculate how much the light is being bent by the tape by looking at what colors are visible... it seems to follow the complimentary color rule: yellowish orange with blue, green and red (although it's kinda hard to see and it seems to like to switch to the next set instead of stay at green red), and purple and apparently a dark blue/teal and some orange for some reason? idk that last one is iffy cause purple is supposed to be opposite yellow and blue is opposite orange. but all of that is paint color theory so idk how it would work in visible light spectrum as these objects are letting certain light pass through rather than reflect. also it seems at the 45 degree angles the whole thing goes back to clear, so maybe that diagonal light is not getting split?
What about windshields? Some cars, especially the ones from the 80'-90' have this checkered rainbow pattern, mostly on overcast days? Is this polarisation pattern from stresses in the glass from manufacture? It also changes colors with head tilt? I've never mentioned or discussed this with any other living soul, presuming everybody sees it?
Those are actually called closed-eye hallucinations. en.wikipedia.org/wiki/Closed-eye_hallucination They aren't because of polarized light or anything, just your brain.
Since flat surfaces reflect polarised light, wearing polarised lenses in rain, fog and snow gives you x-ray vision...okay not really x-ray vision, but wearing polarised lenses makes the objects “hiding” in the opaqueness appear more distinctly because the light reflected off of them is polarised, the lenses block a lot of that light making cars, trucks and boats appear darker and contrast more strongly against the background. The effect is quite amazing. I first noticed it sailing in the fog...with glasses on I could clearly see the shapes on the boats and their sail and with glasses off, I could barely make out their outlines. Works great when driving in heavy rain in that you can see cars through the spray much further away.
This video just made me realise that I _really_ need to clean my monitor.
Same, my monitor is disgusting and all I can see is the filth against the white youtube page...
yeah my screen is a mess
Teagan P lol i have the dark theme
Lol
Realize is spelled with a z.
I remember as a child I broke a calculator and discovered that its LCD digits can only be viewed by a thin plastic film cover. For years I kept wondering how much of this world is hidden behind films like that.
could be a reason some can't see the things, some people call ghosts. some people can see them, some can't. Interesting thought. Maybe also, some people say the typical grey alien description, with the big eyes, aren't eyes at all, but, lens coverings for an eye behind that. Maybe they help them see things like this, that would otherwise be invisible, that would be interesting. Possibly why they say pets react to & can see spirits too.
@@Dropla very cool ideas maybe could be cool to integrate into fictional short story form could be fun
@@Dropla Ooooooooh I love this!
@@TrevorPhillips2024 that could give birth to a pretty sweet Halloween themed d&d campaign
@@Dropla Ghosts and spirits don't exist.
As a photographer, the qualities of light have always astounded me.
Its a never-ending rabbit hole of science.
Optics is key with astronomy. Polishing glass to boggling tolerances is fun.
Science is full of rabbit holes...and now for some reason I feel like looking up information about a rabbit's digestive system...
@@matthewwriter9539 rabbits have interesting digestive systems. It requires them to eat near constantly, because if the guts stop moving they can get a blockage and die.
And the hole travels faster than you
"Science Rules!"
We did this in polymer engineering class, and I always thought it so cool. Years later, I gave my operators polarized safety glasses so they could see certain defects in tempered, parabolic segments of glass. It worked too well! They saw everything and started rejecting stuff that was in-specification, lol.
What type 9f engineer are you
I guess, in that case, specifications should be a little more strict 😜
Thanks for the collab Dianna, it was super fun ! Nice snowboarding skills, too :P
Plus de collabs Léo ! On t'entend pas beaucoup parler anglais !
À quand une collab avec des youtubers polonais ? :3
J'ai compris que ta partie
Cette accent 😍
J'aime beaucoup ton accent et le contenu ! Ça fait plaisir de voir deux de mes youtubeurs préférés dans une même vidéo. J'espère que cette vidéo pourra t'apporter des abonnés car ton contenu est vraiment génial.
I accidentally stumbled on this effect many years ago while driving a Volkswagen Beetle. I looked into the centre rear-view mirror and was shocked to find that the rear window had crazy rainbow-coloured blotches all over it. However, when I took my polarized sunglasses off, the effect disappeared. I later learned that it was a bad idea to wear polarized sunglasses whilst in the cockpit of a plane, because the same effect can occur with an acrylic windscreen, severely hampering a pilot's visibility and creating an unsafe condition.
The bigger reason pilots don't wear polarized sunglasses is it will blank out cockpit displays.
Well, that and the fact that you don't really have to worry about glare from horizontal surfaces while flying.
@@brianwright9514 they see all the same horizontal surfaces and more, including glints off of other aircraft which are very important not to miss... so they can be missed.
for me it was the magnifying lens sheets stuck on windows in the 80s to see blindspots in vans. LOL
Sunglasses and car windows do things like that, probably because tempered car windows are made of multiple layers.
I found out about the LCD sheets and what they can do, by myself, when I was a little kid in the '90s, by disassembling and reassembling a Gameboy.
It blew my mind!
I got the polarized sheets from the front and back of the display and made a pair of glasses with a frame of paper cut out.
People would see me wearing that ridiculous thing while playing with a Gameboy that was clearly broken ('cuz they couldn't see any images, only hear the noises) and they would think I was a little odd.
But when I showed them how I could see the game through the glasses - then they were sure that I was indeed really odd.
One cool thing not mentioned in this video is that if you put the sheets against the transparent screen and press a point with your thumbs it creates a quick colorful wave around that point.
𝑻𝒓𝒊𝒑𝒑𝒚. ☼‿☼
@MIXEDUPWORLD when I was a kid, there was no trail effect by doing so. only buzzing electrons. statics. and weird smell.
@MIXEDUPWORLD re: Fingers on your old style tv? Glass- razor sharp when broken- and usually DUST! Lots of it.😂🙄🤣😊
I had a few different old TVs growing up and these comments are nostalgia
I had a friend that would frequent LAN parties do this with their monitor to prevent screen peaking from other people.
@@Malaphor2501
Now that's next level 1337!
XD
Now i know why people think im crazy when I talk about the "iridescence" in light
My kid freaked me out when he was younger and was staring at a light saying "I see all the colours"
Right, I always thought people could see the rainbowy patterns on plastic ware...
@@Hysube I don't see it in most plastics, but occasionally I do. I always just assumed that those plastics were different, but the effect is so faint I hardly ever notice it and don't point it out to people
@@surelock3221 I don't either I was just unawares of those who couldn't see it lol
Yeah same I thought everyone could see it
So much fun!!! Thanks for coming over Dianna! Sorry my place is such a mess 😅
I'd expect nothing less.
No matter the place provided you have fun ^^
Nothing is THAT fun... omg! I wish I could become toddler-euphoric over some pretty colors. No shade tho 😎
Look at this, turn your head left and right ::cuts away from thing you just told me to look at::
you're expected to pause :p
pause video
Except when ya pause the screen greys out.
@@rainedaywoman Must be your set up. I just get a white screen. Do other videos on TH-cam grey out when you pause them?
TH-cam has ALWAYS grayed the screen out when paused for me, across 3 PCs and 3 phones totally 4 operating systems and 3 web browsers. It's impossible to even do the thing they are asking you to do, it's like this video was made by 14 year olds.
0:07 "I'm here with my friends"
Friend just casually putting tape on other friend's face.
As long as its not duct tape you should be fine. Unless you are into that sort of thing, but hey, we dont judge!
@@anarchyantz1564 yea
@@anarchyantz1564 shall I say r/wooosh ?
That's what friends are for....
@@anarchyantz1564 Duct tape is over rated. Except on lips- don't let it touch the inner part of your lips. I tried using duct tape to remove hair from my leg once, and it didn't work.
I found this out by accident while wearing RealD 3D movie theatre glasses at home once and eating a freezie (one of those frozen tubes of flavoured juice that you give to kids, if you don't know) and I looked at the clear packaging through the glass with my monitor in the background and it blew my mind. I spent like 20 minutes just rotating it and trying out different pieces of plastic and I was firmly mesmerized. I looked up some explanations online, but this video is one of my favourites. Awesome content.
You must eat a lot of carrots, I don't see anything. (Literally, the pigments thought to be responsible for this come from carrots)
That transition to dirty biology was super slick
ikr, they went full Vsauce :D
I would go watch is channel if it wasn't all in Frenchfries
*French
@@freddy_boi_5642 You can enable subtitles on most videos
This isn't a physics girl video, this is a video of a guy called Léo watching a physics girl video. Almost like Inception.
Olaf Doschke th-cam.com/video/ORzkjXg6M4k/w-d-xo.html
Only some humans can see this type of comment.
hello people who scroll down to view comments on a video
Dang, I can't see it :(
Ehm what are you replying to? :-)
I know lol why do they say "some humans"?
What did you say? I can't see you!
I tried moving closer to the screen and realized that the yellow blobs became much smaller. Then I moved a few feet back and the yellow blobs were now much larger. You don't need to look only in the middle of the screen. The polarized light blobs can be seen anywhere on the screen. Wherever you look, they appear. Just tip your head and they move back and forth! I now feel confident that I can travel with the migrating birds and sea turtles. Thanks Dianna.
Hmm, nope, didn't work for me. I wonder what percentage of humans can see it.
Edit: now actually I do see some yellow - for me it helps to tilt the laptop rather than my head.
@@MacNerfer - You will need your laptop to be able to migrate with sea turtles and birds.
Didn't work for me
I can't wait to read all of the arguments in the comment section. This video was very polarizing.
Oh, hey, your puns are here, too. I almost thought you were only around in the SciShow comments :P
I wave off your criticism, since it's out of sync with the modern perspectives.
Personally, this video resonated with me very well; maybe you're just not on the right wavelength my friend... if you just open your eyes, I'm sure you'll see the light.
IceMetalPunk
I'm glad to see you here too, Physics Girl is great! Fun topics and demonstrations. SciShow has a regular upload schedule, so it's easier to pun around there :)
Justin
Polar bears at the North Pole... now just wait a Dipole Moment there...
(Chemistry joke, probably too obscure to be funny)
I didn't see anything, but my neck made some weird crunching sounds...
Me too
Surprise. I saw it very clearly both yellow and blue. I'm having my day now!
were you wearing glasses?
@@RoseyRosies I do own glasses, but I can't even remember if I wore them yesterday, let alone a year ago 😂
@@MsBlulucky meh
dirtybiology = best french science youtuber
Logan Danhier i agree but I which he makes more videos T-T
To me, it is Bruce from e-penser :D
Pixel_Vengeur Bruce déçoit un peu depuis un an, Léo propose tellement de qualité de mieux en mieux en plus ! Mais on a de bons scientifiques sur le youtube FR
Je ne suis pas de cet avis, mais je le respecte. Y'a un truc chez Bruce que je ne parviens pas à m'expliquer, et que je trouve que Léo n'a pas, peut-êter un cynisme ou l'autre, je ne sais pas.
I prefer "science étonnante" but Léo is very good
Something really interesting, not mentioned in the video: the yellow-blue Heidinger brush also is visible in nature at the sky. It stands perpendicular to the sun, best visible for a brief period of time during sunrise and dawn.
I have tetrachromacy. I see colors that you can see.
“Hey can you see this light?”
“Dude I’m blind”
IgnitedZucc 25 was going to post this but you kinda beat me.
th-cam.com/video/gwgOUzodS6E/w-d-xo.html
Wait what!? dirtybiology !! Cocorico !
He told us about this collaboration in his last video and that's why i was so frustrated when the last video of physics girl came out
cock-a-doodle-doo! lol
9:06 "variéti"
Léo me fait tout de même extrêmement rire
Je pense je parler tres mauvais francais mais j'essayer un peux sans google translateur :p voila je "hope" je dire un "sentence" correct en francais :p
tu as raison, c'est très marrant.
@@The-Cat votre français est très bon! continuez!
@@The-Cat not bad at all, the correct sentence is : "Je pense que je parle très mal le français mais j'essaie un peu sans Google Traduction :p Voilà j'espère que j'ai dis une phrase correcte en Français"
Et le fameux "camouflage" avec un bon accent français
ok I feel this wasn't explained clearly enough so let me explain:
1. The first polarized film filters the light so they all have the same polarization/direction.
2. The tape then refracts the light differently depending on wavelength/colour, but since they all started out in the same direction all light of the same colour is now twisted the same way.
3. Finally, the second polarizing filter now sorts out the light of one particular direction and since we determined that a particular colour now have a particular orientation, it's going to let through a certain colour.
It's the nanoscopic air-gap that refracts the colours, just like oil on water but since the distance is not perfect and they used more than one layer you will see other colours as well that will have the same orientation but be of a different colour.
@Mikael Murstam, Thank you for additonal expanation!
you can see those colors aswell when ur on LSD.
SexyGFX true
I was just thinking that when they showed the spoons lol
You can train yourself to see quite a range of things. It's similar to the Tetris effect. With a few exceptions, anything you make your brain do for long enough will eventually become fairly automatic.
I have seen it on my migraine medication
Ah, the good old days...
me: oh yeah I'd watch that guy.
physics girl: oh yeah it's in french.
me: oh....
That's a shame, could someone strongly encourage Léo from Dirty Biology to make his videos subtitled in English?
Lots of his videos have English subtitles
@@klemmichard8916 How awful ! Could anyone strongly encourage english speaker youtubers to make them videos subtitled in English so we can translate them ?
his newest content has often english subtitles that isn't as bad as the accentxD
@Emilio Vicente I think French is quite difficult to learn
Nobody:
The French guy:
Peauleaurizashione
5:42
😂😂
DirtyBiology
Lol true true
Paul Le Rouge A Sionne
I keep watching your videos over and over again, everytime they pop up in my TH-cam homepage, because every second of each video, I'm sending positive energies for your prompt recovery Diana. We love you, and with all our hearts, we keep wishing for you to get better! 💖
One of the coolest part is having 2 polarized filters so that nothing passes through... and then adding 3rd filter between them and all of them become transparent once again!
joonatanu Wait, seriously? How does that work?
I'm not sure if that happens. Let me check
they dont become fully transparent, the middle filter just "refreshes" the polarization and allows some light (but not all) to make it through.
iau
Say filter 1 is vertical, all light coming through it is now vertically polarized.
Filter 2 is 45-degrees diagonal. Equal portions of the light is either let through or blocked (vertical light can be broken up into 2 diagonal components).
Filter 3 is horizontal. Once again, equal portions of the light coming through the diagonal filter is either let through or blocked (diagonally-polarized light can be broken up into vertical and horizontal components).
So you basically use the middle diagonal filter to "rotate" some of the light so that it can then pass through the horizontal filter.
Edit: Keep in mind, vertical and horizontal are relative to your reference frame which is arbitrary. Nothing is inherently _vertical_ or _horizontal,_ it's more about measuring perpendicularity. A photon that is polarized perpendicular to its filter won't pass through. Otherwise, it has a _chance_ of passing through.
Its because the light only cares about the difference between both filters. The equation is cos^2(theta), theta being the angle between both filters. So if you have the two filters at 90deg from each other, then it gives you 0% light exiting. If you have a middle filter then you have 45deg from first to second which gives you 50%, then second filter to the last gives you 50% again, which is ends up with 25% light at the end.
Diana, your enthusiasm and child-like delight at all things physicsy always put a smile on my grumpy old face. Your channel is worth more than you realize.
Curiosity. Only thing not holding children back.
@@jacobshirley3457 Lack of curiosity is what holds us older folks back... (aka adults). I'm glad I still maintain a strong sense of curiosity.
I see this all the time on shrooms
And more! there are colours you see/experience/feel/smell while tripping on psychedelics like Psilocybin or LSD that just don't exist outside of a trip.
._. …im intrigued
Delta Novum true
@@DeltaNovum acid is fun
You can be intrigued guys, but just be careful please.
I hope you get well. It breaks my heart to hear of what you're going through. I absolutely love your content, and love your energy. I wish wellness for many years for you and your husband.
"Huh I can't see shi-
WHAT THE FRIGG"
Frigg is mythology
I see dis light when I look at my iPad screen but it’s off
Then ur blind
"...while looking at your LCD screen"
* tries to do iー *
Clip of them trying it starts...
about:blank
instead
Edit: about:blank is command inside browser to show blank white page, you can put in your browser URL
@@Nurutomo or just pause on that portion... But yeah, that kind of annoyed me, too. (If they told us to pause, I missed it.)
@@DavidLindes No warning, actually had to back track twice because the transition was too quick.
i don't get it
oh nevermind i get it now
Just FYI to everyone, the sheets are pretty cheap on amazon. Make sure to check the reviews though. Some are sold alone, some in packs. Some are 6in x 6in, some are 3x3.
KevinMcNoodles If you don’t wanna w8 in the mail you can salvage old laptop screen from their filters with a good cutter and a steady hand. There’s a tutor on Instructable
I agree, that is the best way to get them. I disassembled more old LCDs from defective notebooks with damaged screens like more than 10 years ago.
2:45 Physics Girl: I am moving up and down side to side
Lando Norris: Like a rolercoaster
Another weird thing about polarization is that as you add more layers of the "tape", it actually can let MORE light through than fewer layers. It can get VERY weird and unintuitive.
Wow, as a French viewer, I wasn't ready to see Leo from Dirty Biology.
Thanks to share other channels than English languaged ones.
Great video by the way
Didn't expect to see Leo there, his accent made me laugh... But just a bit, I probably can't do better huehue
BR?
My name just so happens to be Leo and what they’re showing us is basically how LCDs work
Cool content! A few years old and still interesting. Hey, in photography we use circular and linear pole filters for lenses - mostly, to eliminate reflections (water surfaces, windows, and so on), but also as tool to enhance the color contrast. (λ/2 - λ/4)
I find more mysterious why _only some_ humans can slightly perceive polarisation.
Only only some have color blindness, some humans have faster reflexes than others, only some people are blonde.
We are all individuals with different properties.
Yeah I tried this for a while, I have no YellowCirc pigments in my eyes for sure...
I discovered I can see it too - I saw what I would describe as "yellow wings" - but not the blue. Really cool
It's not that strange, some people have a lot more sensitive eyes to light in general. It's for that reason I wear sunglasses all year round.
Hermione is not happy with Ron and Harry. Hahaha. Exactly.
I know words, I have the best words. Nobody respects women more than me. I am the least racist person who you have ever met. Nobody lies better than me. Believe me. Sad!
...i'm hermione
Haha
I will now refer to my favourite Science TH-cam as Harry Potter Characters:
Michael from VSauce would be Neville, cause he can carry this on its own
Myth Busters would be Fred and George, always screwing around
Mark Rober would be Charly, he worked with fire breathing things
Kyle from Because Science would be Bill, cause he's hot
MattPatt would be Luna, I blame the nargles
Neil DeGrasse Tyson would be Lee Jordan, the Radio host
and Carl Sagan is Dumbledore, cause he's the OG
HiopX hahaha that's nice. 10 points to gryffindor
Anyone ever noticed the stress areas on some car tempered glass windows? normally I see them as a grid of circles from where the flame heads heated the glass during manufacture. They get darker and lighter inversely somewhat when tilting you head.
Never noticed. But now look crazy doing the head tilt cross-eyed looking at my car window. I’ll keep an eye out for this though
omg I thought I was the only one, funny I didn't make the connection when watching the video but at least now I can learn more about it.
Yeah whenever I drive with polarizing sun glasses it gets so strong that I have to not try to look at all the different patterns of all the different cars on the road.
look at it through polarized film or glasses. Does the same thing as the knife and fork did in this video.
I was wondering what that was!!!
If you have a 33.3 rpm record, put two strips of adhesive tape radially (center to edge) across the tracks and press them into the grooves so the adhesive copies the grooves. You now have two polarizing lenses. Put one on a piece of acrylic, the 2nd on another and experiment. The lines in the adhesive will act as polarizers.
Dianna, you're amazing!!!! So much energy and enthusiasm. You are without a doubt my favorite TH-cam-er! You're simply the best, better than all the rest!
Want to *really* blow your mind? Put two polarizers at 90 degrees to each other, so all light is blocked... Then insert a 3rd polarizer between the two -- and you'll see the light coming through again!! 'Splain how three polarizers block *less* light than two polarizers!! Go Google that one -- it's a really cool explanation.
It's bell's thoerem yall
Mariano Ntrougkas but the point is that it’s so counterintuitive! From face value it seems non sensical. The 2 initial filters block all incoming light. So adding on in between shouldn’t change the outcome...or so it seems
@@Riiisuu I think it's counterintuitive because most people would expect the 3rd filter to be added to the end (after the light has been "cancelled"). If you put it in the middle, it would probably interfere with the cancellation, so then it's unsurprising.
Ryan Stallard but most people would think that it would increase the percentage blocked, not decrease
@@Riiisuu I hope most people would not have thought that. If you think you can increase the blocked light past 100%, I want what you're smoking. Would be sick. "Buy a Flashdark today!"
Ooooooh Leo Grasset in da place
On l'attendait cette collab' !
Pablo M oh oui j'ai ete tellement déçu qu'elle ne sorte pas plus tôt. ..
tant que ça ?
Pablo M TELLEMENT! Mais maintenant faut que elle elle aille sur dirtybiology!
Et elle parlera en français ? (si c'est le cas, je suis pour, à 101%. À 101% parce que je suis à 100% pour si elle ne parle pas en français, mais ce serait encore mieux si elle le faisait, donc il faut augmenter un peu)
Seriously one of the most entertaining AND informative channels I have found this year. I love it!
Hello mam
How are you
Mind blowing
Reply mam
Was sitting in my car watching this and remembered I had a pair of imax glasses in my center console. Water bottles are pretty neat looking lol
i could have Leo talk to me about cat litter and i would be in love
yeah, he does have that effect doesn't he...
Wait, he wasn't?
my understanding of light just went levels up
Ooohh she liked it , she liked IT !!! .. hey maaaaa ..
This girl's energy is literally half of the reason i watch her videos.
She doesn't stop does she, ha ha.
"literally"
Like any self-respecting 20-something, my phone has a crack in the screen. I put a piece of really clear shipping tape on it it prevent the crack from spreading. Imagine my surprise when I looked at it with my polarized sunglasses on and saw this effect!
Humans can't do it without the aid of sunglasses... Or can we?....[dun Dun] Hey Vsauce, Michael here....
Was not expecting Dirty Biology
Not complaining tho
I'm impressed that they got through this whole video without saying "wavelength" or mentioning the electromagnetic spectrum. At least I learned kind of what polarization is.
When I tilt my head very fast counter-clockwise, I get horizontal yellow dots,
when I tilt my head very fast clockwise, I get vertical yellow dots.
Now I feel dizzy.
At first I just smiled at your "fast to dizzy" comment. But with unknown reason I followed it, and then I saw the yellowish dots!
When I followed the "tilt slowly" instruction, I didn't notice the yellowish dots. Now I can see it. Thanks. :-)
yeh, it does do something odd... like it rotates in the opposite direction as your head rotates
I could see those dots without turning my head...
at first i was like "what I can see them without turning my head"...
and then I realized that was because I was lying on my side while watching the video xD
thats your brain being pounded against your skull as you move. you are died now
I see it! I thought I was imagining it because it was so faint, but it looked exactly like they described!
Also, I've always wondered WTF was going on with 3D glasses, now I know.
3d glasses are not the same at all lol
@@animeloveer97 i'm pretty sure they are tho? I mean those greyish ones.
@@animeloveer97 modern 3d glasses are polarized. One side is vertical and the other is horizontal, so one eye is only seeing half of the two slightly parallaxed 3d images. Some IMAX screen used circularly polarized light and one lens is clockwise and the other is counter clockwise, It creates a less perceived flicker in 3D films.
Good video, as always. I always love your enthusiasm, Dianna. Thanks for sharing it with us.
Is being able to see polarized light rare? I've always liked just looking at things until I got the slight eye burn in and then blinking, the polarized light is really visible if you do that.
wow! i've noticed this effect before and thought i had an eye defect - didn't know it was actually this! mindblow
fusi sekaita I’ve seen it while wearing safety glasses and looking at plastic objects like car headlights.
4:51 "THE NATURAL WORLD IS FULL OF 'FLAT' SURFACES"... Shows a large body of water.... ... . . *geo vs helio argument intensifies*
flat is where the slope of a curve is 0. And on a sphere every point on the sphere has curvature 0.
@@livedandletdie what?
@@livedandletdie uhm... no?
LOL
@@livedandletdie Actually, every point on the sphere has curvature different than zero.
Watching this whilst waiting for clouds to clear so I can see the eclipse
Tibees eclipse...?
It was surreal... The moon kinda looked like mars.
Tibees The super Blue red moon?.
Thank you for keeping the white polarized image on on the screen TWICE for about TWO SECONDS EACH. That's certainly enough time to examine if I can see some faint unknown pattern that shows up only when i repeatedly tilt my head slowly from side to side...
Wow I’m early but it’s midnight where I am and the only reason why I’m up is to watch an eclipse!
It’s cloudy.
same
Sarcastiic Gamer it’s midnight where I am time zones we’re plus 10 gmt or something
Its cloudy here too :( nasa has a live broadcast of it though so theres that i guess
Shiny Pichu yeah I’m watching that lol always be better irl tho 😢
Sadly here in Scotland you can't see it because 1) it's cloudy and 2) it's daytime!
"Look at your LCD screen"
Me: see nothing.
Me:
Me: Oh wait this is a LED screen
what lmao
@@cracqheadish908 her experience works if you use a LCD screen, if you use an Oled/Led screen it won't work
Oooooh... that's why it doesn't work on most phones...
@Sn4ke_Eyes yep
@Sn4ke_Eyes IPS is a type of LED panel/screen.
"Or can we?"
Ding Dong, Diana here
That's copyright infringement !😆
Fun fact: the Vikings used a "birefringent crystal" for navigation in high latitudes, where magnetic compasses are unreliable. The crystal could tell the navigator which direction the sun was even in an overcast sky.
Thank you so much for clearing up the navigation in those episodes of Vikings!
3:00 you mean... "Diagon Alley" polarised ;)
Nice
I know words, I have the best words. Nobody respects women more than me. I am the least racist person who you have ever met. Nobody lies better than me. Believe me. Sad!
Oh, vocal cords, I couldn't help it. Is it even possible to not laugh at that string of nonsense?
We never knew it at the time, but that's why the 'LOLWUT?' meme was created so long ago.
You make my day better. I love your energy and appreciate the knowledge you spread, best of luck with your future endeavors!
Omg thank you ! I've always wondered how the polarized lenses you put on the microscope to examine rocks works !
(D'ailleurs Léo c'est quoi cet accent anglais ?? :p)
Your enthusiasm is wonderful!! Your description of polarization is spot on too!! I enjoyed your video muchly!! A++ Physics Girl!!!
The refraction of light is related to the dielectric constant it's awesome for doing 3D art , along with using horizontal and vertical lines of contrasting colors.
This brought back a memory of a old art project .
I saw the blue and yellow lights
But very very faintly
Enhanced vision: check;
Fur: kinda;
Preying on small animals: since 3;
Always falling on their feet: in progress;
I di d not se it
I only saw the yellow, faint but enough to know you can definitely see it.
I also just saw the yellow but it was vary faint and not the same shape as in the video.
I see also a grayish area around it.
3:21 when your clock is on acid
did not get it
Made my day ... lol
I laughed way too much! thanks for this underappreciated and underrated comment! :D
Thank you for that explanation of how polarization works, so simple, yet so hard to get until it's explained well. Really appreciate it.
Hahaha, now I understand the tape on William's shirt during the Patreon live stream :P
NOW you know why he was late.
You're totally right! I forgot about that! Haha!
Physix girl always has the best energy. She makes learning feel like playtime.
♡
pervert
It's called ADHD.
imagine what she makes playtime feel like...
Not like my physics teacher at school
This was awesome! Honestly I love learning about light! You should do more light videos! Anyway loved the video!
Very glad to see science becoming popular again. Your videos are interesting and educational.
Good work Physics Girl!!
You said that some humans can see polarized light. All humans that are not blind can see polarized light. Most can not detect which type of polarization it is. I know what you mean, but it would be better to have said that only a few humans can detect differences in polarized light, not that they can "see" polarized light. I'm being picky, I know. I love your work.
Agreed, it is not specific to only some people. It helped make it click bate.
It's meant to be a stereotypical click-bait title, complete with arrow (though missing the cliché red circle).
this is why i always risk reading comments. that really helped clear some things up for me, thank you :)
Ron Jones click bait central round here
Cant see it personaly and im not blind or colorblind or anything else.
its sweet dee with her life more together
Is it me or just Leo is so cute and hoott !
I just saw again this video and I liked myself after a year. Yass
All I can focus on was that piece of your hair sticking up at the end, thanks for a good laugh, love the science, you're awesome! ✌️😀
I thought I was crazy for thinking this! I noticed that the sunshine reflecting off of rivers that are high in tannic acid from the leaves (blackwater river) was bright violet under polarized sunglasses. Yet I noticed I could still perceive the color although much less obviously so. It was the kind of thing you wouldn't notice unless you were specifically looking for it. The same thing happens although to a lesser extent with a blue sheen to freshly paved asphalt.
@Physics Girl Your enthusiasm is ecstatic, I love it :D
Crossed polarized sheets. I use that all the time when analyzing minerals. Take a look at pics of thin section slides of rocks taken with crossed polars. Some are gorgeous, most are interesting and unexpected.
Thanks
Wow, il wasn't prepared to view a "dirty biologie" featuring on this vidéo. So cool
...aaaaaand now i wanna build a round window with rotating polarizing filters.
So... now we know how the aliens were able to 'hide' in "They Live". 😄
nobody:
my adhd brain: delightfully stares at the rainbow patterns in clear spoons anytime i’m at a dinner party… realizing now that nobody else sees it & i’ve looked like a crazy person for years
"What our we doing today brain"
"Same as everyday pinky, TAKE OVER THE WORLD"
Her shirt reminded me of pinky and the brain
Something interesting to note is that most wireless routers (anything better than the cheapest ones) send and receive radio waves at different polarizations to encode more information into the same bandwidth. Going from one to two nearly doubles the bandwidth, while going even higher only gives incremental improvements since there can be only two polarizations that are orthogonal to each other. (That's why with a router that has external antennas, it's recommended to position the two outer antennas at 90 degrees from each other.)
A good visual analogy would be two projectors with orthogonal polarizations playing different videos at the same screen. Look at it directly and you only see a mix of the two videos, but look through a polarizer and by adjusting the angle, you can see just one or the other. (That is how some 3D display systems work.)
True for some models, but other models with multiple antennas are designed to have all antennas in parallel. Some of the advanced ones rely on other techniques for maximizing signal strength. Check what applies to your specific WiFi router or access point.
I have a cheap Netgear AP that looks like it's polarization domain multiplexed from the outside, but take it apart and it becomes evident that it actually uses each antenna for a different band. It is, however, far less common than most modern routers which do take advantage of polarization domain multiplexing. On a side note, because there are only two fully orthogonal polarizations, if you have a router with 3 or more antennas, it makes sense to think in 3D when orienting the antennas, trying to make sure any device in the space of interest would get a good signal from at least two of the antennas.
NiHaoMike that's interesting. They didn't including this in my education
It's the sort of stuff IT techs learn about.
Whats this have to do with light?
Get 3 of these polarised sheets and hold one vertically and the next one behind it at 45°, then a 3rd horizontal. If you love maths and physics then this should blow your mind.
you could probably calculate how much the light is being bent by the tape by looking at what colors are visible... it seems to follow the complimentary color rule: yellowish orange with blue, green and red (although it's kinda hard to see and it seems to like to switch to the next set instead of stay at green red), and purple and apparently a dark blue/teal and some orange for some reason? idk that last one is iffy cause purple is supposed to be opposite yellow and blue is opposite orange. but all of that is paint color theory so idk how it would work in visible light spectrum as these objects are letting certain light pass through rather than reflect. also it seems at the 45 degree angles the whole thing goes back to clear, so maybe that diagonal light is not getting split?
And cameras they too can see this magical kind of light
Tip... the further away you are from the monitor the better. I was not seeing it until I pushed the chair back like one meter.
My god thank you i always thought everyone saw colorful dots at night time but i think i just see polarized light
No, I dont see polarized light (I couldnt see the yellow or the blue) but the dots are normal.
You mean ...stars?
What about windshields? Some cars, especially the ones from the 80'-90' have this checkered rainbow pattern, mostly on overcast days? Is this polarisation pattern from stresses in the glass from manufacture? It also changes colors with head tilt? I've never mentioned or discussed this with any other living soul, presuming everybody sees it?
when stare at the darkness at night all i see is colourful light film grain ,is this weird or am i saying it wrong.
Those are actually called closed-eye hallucinations. en.wikipedia.org/wiki/Closed-eye_hallucination They aren't because of polarized light or anything, just your brain.
Since flat surfaces reflect polarised light, wearing polarised lenses in rain, fog and snow gives you x-ray vision...okay not really x-ray vision, but wearing polarised lenses makes the objects “hiding” in the opaqueness appear more distinctly because the light reflected off of them is polarised, the lenses block a lot of that light making cars, trucks and boats appear darker and contrast more strongly against the background. The effect is quite amazing. I first noticed it sailing in the fog...with glasses on I could clearly see the shapes on the boats and their sail and with glasses off, I could barely make out their outlines. Works great when driving in heavy rain in that you can see cars through the spray much further away.