As a Domino Artist who sets up thousands of dominoes for a living, I went crazy when that brick domino video went viral because this is actually a standard domino trick I've set up many times! Countless people sent me that video asking me to explain how this domino effect worked, so I'm really glad you made this :) Perfect explanation!! Let me know if you ever want to work together on another math/science domino video. Loved the domino computer one you made on numberphile as well.
@@jjtrio3972 after binge watching a load of these videos I'm now wondering if I can actually confirm your statement from the one data point. Or whether you made the statement to get people wondering that? More TH-cam 'research' I guess.
Yep. He could build a wall over it so the line goes under, topples down backwards again, and when the last brick has fallen down completely, it triggers the wall to fall.
Atticus Koya okay now I'll be sad till he unboxes a brick calculator with one functionality that takes the width and height as input and gives 'd' as the output. Matt please!
"speed of domino falling" gives me a paper from 2005 that gives a speed of the forward wave. The of the backward depends on the distance between the bricks. The possible values are between 21 and sqrt(21*21+6*6)=~21.8 cm. The minimum speed is attained at 21cm, depends on friction, and I couldn't be bothered to calculate that. The maximum speed is attained at sqrt(477) cm and seems to be close to the speed of sound in bricks.
Americans be like: - 0:25 A brick domino? Pfff done that. - 0:39 A second, returning wave. Seen that many times before. - 1:59 Centimetres... What is this sorcery !?!?!?
Your thumbnail gave it away in a good way, halfway through the first set of falls I said to myself "that last brick's" gonna sit flat causing another chain reaction to cascade back. thank you for the good videos and education, I'm a long time fan.
I like the unintentional comedy of having spectators for the domino demonstration, but by the end nobody's watching. This results in the viewer feeling like the proverbial last kid in class talking to the teacher like a complete weirdo 10/10 would relive my school days again
The fact that the brick is longer om the diagonal than it is on one side is known to any joiner. Doors exhibit the same property. Since the hinge pivots on one edge of the door, and the first point which hits the doorframe on the other side is an diagonally opposite edge, a close fitting door would bind as it is slightly wider than the doorframe at that point. The solution is to plane a slight slope in the side of the door which has the latch and handle. It is known as a 'lead in'. Also, I suspect those brickies had a fair idea what was going to happen. Working in the trade constantly throws up effects and situations that you would not normally even consider otherwise.
I am absolutely enthralled with Matt Parker's lectures and demonstrations. I hope he continues indefinitely on TH-cam. The lesson on falling through the earth was outstanding as are all of his projects.
Come to think of it, this is actually a decent way to explain recursion. Each brick "function" calls the next brick "function" until one of them returns zero, then that return value backpropagates through the waiting brick "functions".
Step 1. Set bricks up flat Step 2. Stand bricks up Step 3. Knock bricks over so they are lying flat again exactly how they were before standing them up
Yay, as someone who draws masonry for a living, it's finally my chance to point out a pedantic correction! That dimension is actually height, not width (width would be how far it sticks into the wall). Okay, there's your completely useless info, carry on. :D
In math, yes. But in architecture, construction, and masonry they have generally accepted meanings in many stiuations. If you don't believe me, try building a house, but changing them around first on the plans. ;)
I was trying to find angles of triangles the other day at work and since I'm many decades removed from my last geometry class I couldn't remember how. Now I know and I am so pleased.
Thinking about it, I feel like there's another formula to be had here. This example laid the bricks touching each other end-to-end and then stood them up. (The spacing between bricks is 0.) Shouldn't we also be able to derive the maximum spacing? Obviously, in a practical example this is the easiest to set up, and as you approach maximum spacing you increase the risk of failures in the primary wave, and premature triggering of the secondary wave, but it seems like there's probably a middle ground where you're less likely to get failures in the secondary wave (like we saw here) but still not that much more likely to see failures in the primary wave.
The funny thing is, his incorrect calculation (correct one in the description) for the overlap, is actually a calculation for the maximum spacing; smaller spacing = double domino, equal or larger = single domino
I love the construction workers just standing there watching, I love to imagine they're thinking "Wtf is this bloke doing? Why's he filming himself pushing over bricks? Who's gonna watch this?"
The irony is that the easiest way to lay the blocks as precisely as necessary to achieve that double-brick effect you first lay them all in the final position and then stand them on end. So the effect is real and cool, but takes much more time than just laying them by hand.
Great vid as usual but "let's look into the maths of the situation" made me giggle. Maths of the situation... I'm sure that's usually called "physics"! :-)
"Spicy Maths" (or sometimes just "Shirazi Maths") is when the Maths questions are of a very advanced (or "spicy") nature. Sometimes, the "spice" is measured using a Nandos' spice scale. Hope this explains to you the mystery of 'spicy Maths' :P
In the Domino Community we call this the fall-back effect. However as it is used that it has both the falling dominoes as well as the fall back, this is indeed the Double-Domino effect - with a fallback (There are more double effects but I dont think they can be made with bricks).
yes and it's the lenght of the portion (calling it k for instance) between the vertex of the lower brick and the vertex of the upper one. Once given width and length of the brick d is fixed and doesn't change no matter the distance between two adjacent bricks and, *if i'm not wrong* , only k depends from that distance and by [0 < k
Creep4Play no... for one, the length of the side in brackets will be larger than 21, so it's x-21 for two, the minus inside the brackets does nothing, because indices are evaluated before +/-s the correct express this would be: 21^2 = 6^2 + x^2 sqrt((21^2)-(6^2)) = X
Creep4Play no... for one, the length of the side in brackets will be larger than 21, so it's x-21 for two, the minus inside the brackets does nothing, because indices are evaluated before +/-s the correct express this would be: 21^2 = 6^2 + x^2 sqrt((21^2)-(6^2)) = X
Okay now this is a spooky coincidence! I was talking about the concept in this very video to my parents today, and now it shows up in my recommended videos!
It's wrong, check the description. Before I read the description, I paused the video and spent a lot of time thinking about how the heck he came up with that number, and then I typed the following comment: I don't see how √(21²+6²)−21 (≈0.84) is the contact length. 21−contact_length is one leg x of the right triangle whose other leg is 6 and whose hypotenuse is 21. So 21−contact_length should solve the equation x²+6²=21², but 42−√(21²+6²) does not solve this equation. With Pythagoras I come up with contact_length = 21−√(21²−6²) (or 21−9√5 which is ≈ 0.88), and then 21−contact_length solves the equation x²+6²=21² as it should. But then I clicked "show more" on the description and saw that he had already issued a correction in the description, so I clicked cancel on my comment. The moral of the story I guess is always read the description in its entirety? lol
the distance the tip of the last brick travels is a pi times the bricks length, so you could use the time it takes the brick to fall, the acceleration and calclulalata
Would have love to heard the conversation with the brickies "Can I borrow some bricks for two minutes? You can have them right back as soon as I've finished filming them fall over" LOL
Wait, I'm not even sure that the correction is correct: "CORRECTIONS - The overlap length should be 21 - √(21² - 6²) = 0.875 cm not the incorrect √(21² + 6²) - 21 = 0.84 cm I show on-screen. First spotted by Daryl Adriano." I'm getting that the overlap length would be around about 2.334. I feel like 21 - √(21² - 6²) would be the "underlap" length. I'm confused here.
That's not a construction site. Our friend Matt steals bricks from innocent homeowners to fuel his twisted mathematical experiments.
Next Video- Calculating the time it take for my nieghbor's corpse to rot
So when a homeowner does construction around his home, that is not a construction site??
@Pyrrha Nikos, that's the joke. Flew right by ya!
a parker square of a construction site
All I can say is we had a chimney
As a Domino Artist who sets up thousands of dominoes for a living, I went crazy when that brick domino video went viral because this is actually a standard domino trick I've set up many times! Countless people sent me that video asking me to explain how this domino effect worked, so I'm really glad you made this :) Perfect explanation!! Let me know if you ever want to work together on another math/science domino video. Loved the domino computer one you made on numberphile as well.
+Hevesh5 We should totally do a domino thing! Drop me an email: matt@standupmaths.com
Ratko Mladic same question...
Surprised to see you here but I suppose if a video has anything domino related you're probably going to be in the comments section
@Ratko Mladic sorry that comment was aimed at hevesh5
@@josephdolman r/Whoosh
Nice work!
+SmarterEveryDay Thanks! That was a fun video to make.
And it has 0 likes? No one break chain pls
@@adarshvenkateswaran795 Haha lol, 6 months.
ye
@@standupmaths how you doing math parker
this should have been uploaded to falldown maths channel
Doctor Robotnik ahahahahahahahahaha
haha, that should totally be the name of Matt's second channel.
Well, he had to stand the bricks up first.
Doctor Robotnik +
But we are still waiting for the Sit Down Maths channel...
Not every brick fell down during the second wave - that's classic Parker Square :)
Yes. But at least he gave it a go :)
That fucking meme gets me everytime
Natálie Kaňáková more like a Parker Brick
Poor Matt will never escape that...
Přesně tak!! :)
This is called the "sonimod" technique
Taikamuna you were right. I do find you everywhere.
@@jjtrio3972 after binge watching a load of these videos I'm now wondering if I can actually confirm your statement from the one data point.
Or whether you made the statement to get people wondering that?
More TH-cam 'research' I guess.
@@jjtrio3972 The funny thing is that this is actually their domain of expertise
Love how you have the coolest part of the video first and THEN explain the maths behind it. Makes me not have to wait so long to the main attraction
Thank you for taking the time to explain how and why this works.
hi
Now can you do a triple?
Oh baaaby a triple! Oh yeah!
+Rishy Fishy what meme? I just asked if he could do a triple domino wave
Vegeta he probably meant to adress to the guy who brought up the Oh Baby a Triple meme.
Yep. He could build a wall over it so the line goes under, topples down backwards again, and when the last brick has fallen down completely, it triggers the wall to fall.
A triple wave that makes all the dominoes stand back up.
Now use bricks as a calculator and have a function for the double domino effect.
Atticus Koya you may either have given me the best or worst idea ever
Matt, please!
Atticus Koya okay now I'll be sad till he unboxes a brick calculator with one functionality that takes the width and height as input and gives 'd' as the output. Matt please!
Using the reverse wave for the carry...
wlan2 Knock all inputs over, but prop up the ends of the zeros and let the ones fall and do the reverse wave
"That d is 1.7 cm"
That hit too close to home :c
Suicide by words.
Underrated dad joke right here
1.7cm can't father very well
@@ArrowRaider Underrated non-dad joke then
Easy lad we've got you! 😂😂😂
This technique is known in the domino community as a sonimod. It's possible with normal dominoes too :)
Wait, there's a domino community? *looks "sonimod" up* Oh, there's even a domino wiki...
I guess it’s technically possible with anything that has a nonzero width ^^
+Qbe Root Is there something with zero width? :D
+Filip Laubert In real life, no :3
+bdbdbd Well they still need to fall over…
+Qbe Root BTW objects with zero width would not even make first wave.
Now I have a bonus question.
Can we calculate the "speed" of the forward and backward waves ?
yes.
Charles Gaskell mathematicians in a nutshell 😂
Great, that's a wrap then. Let's get some coffee and have the engineers pull out their calculators
"speed of domino falling" gives me a paper from 2005 that gives a speed of the forward wave.
The of the backward depends on the distance between the bricks. The possible values are between 21 and sqrt(21*21+6*6)=~21.8 cm.
The minimum speed is attained at 21cm, depends on friction, and I couldn't be bothered to calculate that.
The maximum speed is attained at sqrt(477) cm and seems to be close to the speed of sound in bricks.
Turalcar cm is a distance, not a speed.
Americans be like:
- 0:25 A brick domino? Pfff done that.
- 0:39 A second, returning wave. Seen that many times before.
- 1:59 Centimetres... What is this sorcery !?!?!?
Yeah, because we don't use those here... O.o
Centimeters, what no way it's not like we use it or anything...
Chill, it's just a joke.
LoL I was just about to post something very similar haha.
Americans: What are dominoes?
Parker Brick at 0:40
Wow! I can't believe I've never seen that before. Great trick!
Parker Square Domino effect, right?
That's my name
0:41 that's the Parker Brick right there.
Ok
Your thumbnail gave it away in a good way, halfway through the first set of falls I said to myself "that last brick's" gonna sit flat causing another chain reaction to cascade back. thank you for the good videos and education, I'm a long time fan.
This is awesome, I've never heard of this effect before. It's very well illustrated in just four minutes.
I like the unintentional comedy of having spectators for the domino demonstration, but by the end nobody's watching. This results in the viewer feeling like the proverbial last kid in class talking to the teacher like a complete weirdo
10/10 would relive my school days again
The fact that the brick is longer om the diagonal than it is on one side is known to any joiner. Doors exhibit the same property. Since the hinge pivots on one edge of the door, and the first point which hits the doorframe on the other side is an diagonally opposite edge, a close fitting door would bind as it is slightly wider than the doorframe at that point. The solution is to plane a slight slope in the side of the door which has the latch and handle. It is known as a 'lead in'. Also, I suspect those brickies had a fair idea what was going to happen. Working in the trade constantly throws up effects and situations that you would not normally even consider otherwise.
3:08 is kinda funny out of context.
quality factor of a penis
acetylen :) pamiętam twój film na temat elo hell w League of Legends kope lat temu :)
There has to be a "solve for d" joke, but I'm too sleepy to find it.
ya, if you're 12
brian554xx d=21-√(21²-6²) . Also it IS a right angle triangle (not an assumption) because the consistent placement makes them lie at the same angle.
Well that was a Parker square attempt! Never gets old :')
Very quick and straight to the point, all the info I can for in just a few minutes. This is a quality video!
I am absolutely enthralled with Matt Parker's lectures and demonstrations. I hope he continues indefinitely on TH-cam. The lesson on falling through the earth was outstanding as are all of his projects.
I am so happy that you posted this video! I was a viral video of this happening with hundreds of bricks on a construction site and I was in awe.
Construction workers: "Oh no... there comes the math guy again..."
Come to think of it, this is actually a decent way to explain recursion. Each brick "function" calls the next brick "function" until one of them returns zero, then that return value backpropagates through the waiting brick "functions".
Step 1. Set bricks up flat
Step 2. Stand bricks up
Step 3. Knock bricks over so they are lying flat again exactly how they were before standing them up
Domino's in a nutshell. HAHAHAHA
First of your videos I've seen! Short and to the point and such a great explanation! Subscribed!
I thought he was going to sign all the bricks for a second there
But why?
Fummy he has done it with dice before, and then he started talking about his patron supporters...
As a Math tutor, i love that video. So much calculations in a simple video that people tend to ignore.
How awkward was it to explain to those guys why you wanted to borrow 48 of their bricks? Nice of them to be game, though!
Thought it was funny how the blokes there with a cuppa chillin 😂
@@joejefferis9892 They are British after all! :)
I like the music everytime.
"Hello, may I borrow 2 to the fifth times 1,5 bricks?"
Piotr Domagalski
48
Welcome to the joke
There is something so satisfying watching the wave coming back.
Can there be a triple domino effect somehow? Maybe some special shape? Quadruple domino? Continuous domino?
Rob Harwood no?
Joey Louwrenssen Conservation of Energy
That doesn't prove the answer is no....
Apollys maybe not for finite order domino effects, but it means it's impossible to get an infinite order domino effect
No...... sum of an infinite sequence can be finite...
Great videos Matt! I always look forward to seeing what you are going to analyze. I never knew of this domino phenomenon until now.
Yay, as someone who draws masonry for a living, it's finally my chance to point out a pedantic correction! That dimension is actually height, not width (width would be how far it sticks into the wall). Okay, there's your completely useless info, carry on. :D
+Doodle Vids That's the best kind of correction there is! I'll add it to the list in the description.
So it's Length, Width, Height? There's no Depth to bricks?
ReverendTed in terms of a brick, depth and length are the same thing
In math, yes. But in architecture, construction, and masonry they have generally accepted meanings in many stiuations. If you don't believe me, try building a house, but changing them around first on the plans. ;)
Doodle Vids: Can I try that anyway, even if I DO believe you? Sounds like a lark!
I got math exam for tommorow and now this in my recommendation box? Good job god... Well done
"Hey, guys. Can I just borrow several dozens of your bricks for a little math project?"
With that level of nerdity he was lucky he didn't get a severe wedgie.
Love this Matt!!! I mean, the maths is beyond me, but the effect is sooooo satisfying!
professional mathematician, "one and half stoppages"
I was trying to find angles of triangles the other day at work and since I'm many decades removed from my last geometry class I couldn't remember how. Now I know and I am so pleased.
Thinking about it, I feel like there's another formula to be had here. This example laid the bricks touching each other end-to-end and then stood them up. (The spacing between bricks is 0.) Shouldn't we also be able to derive the maximum spacing? Obviously, in a practical example this is the easiest to set up, and as you approach maximum spacing you increase the risk of failures in the primary wave, and premature triggering of the secondary wave, but it seems like there's probably a middle ground where you're less likely to get failures in the secondary wave (like we saw here) but still not that much more likely to see failures in the primary wave.
The funny thing is, his incorrect calculation (correct one in the description) for the overlap, is actually a calculation for the maximum spacing; smaller spacing = double domino, equal or larger = single domino
That was quite a Parker Square of a reverse domino wave...
0:50 I'm gonna count that as a Parker Square ...
this is... strangely satisfying
I thought this was a really stupid video.
Until 0:37.
+Alex Howe I thought this was a really stupid comment. Until the 9th word.
does it work with regular dominos, kinda a stupid question ik
In theory, it does, but the dominoes are really tiny, so it would be hard to reproduce.
Alex Howe Will the phone microwave ever be put up for sale?
PixelKnighty Unfortunately, due to some unfortunate circumstances involving a certain scientific organisation, we've had to destroy it, our apologies.
Coolness! It feels like something new on YT! Great job Matt
to calculate the D, you need the values of width and length. Awesome.
Chris Lesmerises They don't teach that in school :D
I love the construction workers just standing there watching, I love to imagine they're thinking "Wtf is this bloke doing? Why's he filming himself pushing over bricks? Who's gonna watch this?"
oh so this is how I will finally use math in my life.
The irony is that the easiest way to lay the blocks as precisely as necessary to achieve that double-brick effect you first lay them all in the final position and then stand them on end.
So the effect is real and cool, but takes much more time than just laying them by hand.
Great vid as usual but "let's look into the maths of the situation" made me giggle. Maths of the situation... I'm sure that's usually called "physics"! :-)
+David Murphy I agree completely: physics should be called "maths of the situation".
standupmaths Haha, can't argue with that!
David Murphy same
To be fair physics is just math applied to real world phenomena ;)
I will never see the day when Matt finally tells us what song that is (at the start of the video). It's quite cool.
+Andrew Kovnat That is the Stand-up Maths theme and it's available for free on Bandcamp: standupmaths.bandcamp.com/track/stand-up-maths-theme
o.o Thanks!
I wish you taught me Maths :)
Our teacher, Mr Shiraz, teaches us 'spicy' Maths (his phrase, not mine)!!
Evan Blenkinsopp
He must be Mexican then...???
Evan Blenkinsopp 'Shiraz'? Where is he from?
Now that you've piqued everyone's interest, what in the world is spicy maths?
If his last name is Shiraz, likely from Iran.
"Spicy Maths" (or sometimes just "Shirazi Maths") is when the Maths questions are of a very advanced (or "spicy") nature. Sometimes, the "spice" is measured using a Nandos' spice scale. Hope this explains to you the mystery of 'spicy Maths' :P
In the Domino Community we call this the fall-back effect. However as it is used that it has both the falling dominoes as well as the fall back, this is indeed the Double-Domino effect - with a fallback (There are more double effects but I dont think they can be made with bricks).
I thought I was watching Tom Scott
It's like a recursive program reaching a base case and propagating a value back up.
0:50 Physics really has a penchant for screwing up the math(s).
why was that sooooo satisfying to watch.
Now I see why construction takes a long time...
The coolest video you've ever made. Good job!
That's a lot of physical labor for a math professor. Take a break and have yourself a nice liter of beer.
Brick dominoes are so much more satisfying than normal ones
End calculation should have been
21 - sqrt(21²- 6²)
yes and it's the lenght of the portion (calling it k for instance) between the vertex of the lower brick and the vertex of the upper one. Once given width and length of the brick d is fixed and doesn't change no matter the distance between two adjacent bricks and, *if i'm not wrong* , only k depends from that distance and by [0 < k
Great video! Thanks for the formula and thanks for having used the metric system. Thank you!
The contact length at 3:02 is wrong. It should be 21 - sqrt(21² - 6²) = 0.875
Creep4Play that was just a parker square calculation
Creep4Play no...
for one, the length of the side in brackets will be larger than 21, so it's x-21
for two, the minus inside the brackets does nothing, because indices are evaluated before +/-s
the correct express this would be: 21^2 = 6^2 + x^2
sqrt((21^2)-(6^2)) = X
Creep4Play no...
for one, the length of the side in brackets will be larger than 21, so it's x-21
for two, the minus inside the brackets does nothing, because indices are evaluated before +/-s
the correct express this would be: 21^2 = 6^2 + x^2
sqrt((21^2)-(6^2)) = X
Your term for x is exactly the term I used, and it's smaller than 21.
just discovered your channel. enquiry like this fires my neurons . great to be on board.
The contact length in 3:04 isn't 21-sqrt(21^2-6^2)?
the ol' Parker double domino effect. didn't quite work, but YOU GAVE IT A GO
Matt Parker to be the next Doctor!!
He would be literally Parker Doctor :p
Matt! I saw you do this at Maths Inspiration Bath! Great show
We should call it the Parker effect.
Cool video! Great explanation!
23rd like, 'number-file' the smartest and only place on the internet that plays with bricks for science
I meant to say standupmaths I don't know I said numberphile 😂😂😂
Well if True Genius can make a mistake, there is hope yet for the rest of us.
Fabrizio Lungo Hopefully I suppose their is 😂😂😂
Okay now this is a spooky coincidence!
I was talking about the concept in this very video to my parents today, and now it shows up in my recommended videos!
Where did you get that sqrt(21²+6²) - 21 at 3:04? And why that contact length isn't 21- sqrt(21²-6²) ?
Exactly what I was thinking. The length subtracted from the diagonal (which is what he did calculate) is totally irrelevant.
It's wrong, check the description. Before I read the description, I paused the video and spent a lot of time thinking about how the heck he came up with that number, and then I typed the following comment:
I don't see how √(21²+6²)−21 (≈0.84) is the contact length. 21−contact_length is one leg x of the right triangle whose other leg is 6 and whose hypotenuse is 21. So 21−contact_length should solve the equation x²+6²=21², but 42−√(21²+6²) does not solve this equation. With Pythagoras I come up with contact_length = 21−√(21²−6²) (or 21−9√5 which is ≈ 0.88), and then 21−contact_length solves the equation x²+6²=21² as it should.
But then I clicked "show more" on the description and saw that he had already issued a correction in the description, so I clicked cancel on my comment. The moral of the story I guess is always read the description in its entirety? lol
I found your video great. You are so funny and the fact that the brick did not fall all properly was hillarious. It gives you that sense of reality
But can you use this to calculate PI?
No
the distance the tip of the last brick travels is a pi times the bricks length, so you could use the time it takes the brick to fall, the acceleration and calclulalata
Would have love to heard the conversation with the brickies "Can I borrow some bricks for two minutes? You can have them right back as soon as I've finished filming them fall over" LOL
yall gotta listen to that song "Indigo Misfit-Fly" with J.cole
Love that song!
This isn't stand up maths. This is fall over maths!
Wait, I'm not even sure that the correction is correct:
"CORRECTIONS
- The overlap length should be 21 - √(21² - 6²) = 0.875
cm not the incorrect √(21² + 6²) - 21 = 0.84 cm I show on-screen. First
spotted by Daryl Adriano."
I'm getting that the overlap length would be around about 2.334. I feel like 21 - √(21² - 6²) would be the "underlap" length. I'm confused here.
wow that experiment was awesome!! nicely explained as well and easy to understand even for a Brazilian like me
Who else only came to the comments to see the Parker Square jokes?
Me
Me.
It's I and not Me. G'day.
Oh my... it's 1:00 am, it took me 20 minutes, and I have a slight headache, but I finally understand this!
"I just found twelve bricks"
Keep up the great work Matt!
You lost me when you put numbers on the screen.
Lala Cisco just a bit of trig and pythag Init
mini dwarfdude a bit weird init?
Geo/trig is pretty fun imo, especially using altitudes and angle bisectors
FullChicken44 Wrong channel for you then, init?
Great video! I didnt know I needed this, but I'm glad I watched it. Last brick FTW!
2:31 wait a minute! Cos?! Not cosine, but cos? What?!
Cían Mattern cos is short for cosine
Cían Mattern Cuz u know what I mean.
I'm learning this stuff in geometry at school right now, pretty sweet
128th viewer! comment if ur also a power of two!
8192 :3
4096 ...times 3.044921875. Works for me :D
32,400, jus 367 off
35352!
44,912... atleast you get an integer number when you divide it by two :D
I honestly was slowly getting more and more disappointed by the lackluster domino demo right up until it went double-domino. That was great!
0:39 plot twist. I didn’t expect that. Pretty cool
I didn't know this was a thing! Brilliant!
this was so much fun! love it when math and science are explained in such interesting scenarios. keep up the good work!
I need to show my grandchildren this * sets off to buy 4 dozen bricks*