Binder Clip Climber - Numberphile

Featuring Tadashi Tokieda.
More Tadashi videos: bit.ly/tadashi_...
Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): bit.ly/MSRINumb...
We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.
NUMBERPHILE
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Videos by Brady Haran
Editing and animation in the is video by Pete McPartlan
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Brady's latest videos across all channels: www.bradyharanb...
Sign up for (occasional) emails: eepurl.com/YdjL9
A NOTE ON THIS VIDEO:
A few of our Tadashi videos blur the already blurry line between mathematics and physics... Some people suggest they may be a better fit on Brady's dedicated physics channel (called Sixty Symbols).
In response, the reasons they are on Numberphile are:
1) Tadashi, while certainly a modern polymath, is based in a mathematics department.
2) This sub series (with its animation and extra production work) has been supported by the Mathematical Sciences Research Institute, a Numberphile collaborator.
3) Some of the previous and future Tadashi videos are more math-oriented than physics - and it just makes sense to put them on one channel rather than dividing the series between two channels on an ad hoc basis.
In a multi-disciplinary world, it is challenging to run KZbin channels which people come to associate with just one discipline.
That said, feel free to go over and watch hundreds of physics videos on Sixty Symbols --- / sixtysymbols

[@cycklist]

Is there anything that Mr Tokieda cannot demonstrate using his feet?

[@daniellassander]

Maybe a purely hands on aproach? :P

[@xystem4701]

No, no there is not.

[@james-lang]

Someone should make a "Tadashi's Toes" playlist

[@SparkysBarelyMusic]

shoes

[@lpsp442]

How best to wear socks

[@PlayTheMind]

He sure puts the "Ta-da!" in "Tadashi".

[@fossilfighters101]

+++++

[@freshrockpapa-e7799]

lol

[@Halosty45]

+

[@BoWeava]

That he does!! lol

[@GumRamm]

Iv4Pss not quite, apparently it's 時枝正, with the last letter being his first name "Tadashi"

[@ddostesting]

I think Mr Tokieda just walks up to something, wiggles it a bit, taps it with a spoon, or something similar. Then discovers some subtle universal truth. Zen master for sure!

[@kittyrules]

Never clicked on a vid faster than a tadashi video

[@MrRoyalChicken]

What about klein-bottle guy?

[@y__h]

+MrRoyalChicken He sure freaks me out a lot.

[@3snoW_]

Klein bottle guy is too enthusiastic, i feel like he's mocking me lol

[@kittyrules]

Klein bottle (Cliff Stoll) guy is totally CRAZY and cool. but I prefer tadashi

[@wierdalien1]

he is a great showman which helps him explain these things so well

[@superj1e2z6]

_*Feeturing Tadashi *Toekieda_

[@Rhino123freak]

superj1e2z6 *eyyyyyy*

[@fossilfighters101]

++

[@Longuncattr]

+ErikCR Jokes.

[@QuotePilgrim]

+ErikCR Whoosh.

[@Octanis0]

You missed 1 out of 1 joke in this thread. Congratulations.

[@zang1983]

As always with Tadashi Tokeida - upvoted before I even watched.

[@FizzyK-45]

Tadashi definitely should do a collab with Tim from Grand Illusions.

[@nullivory]

omg yes

[@redtaileddolphin1875]

Hm!

[@Suprsim]

RIGHT! Everyone one of the videos with Tadashi I thought "This is a lot like watching Tim. I think the two of them would get along."

[@vibraphonics]

Fizzy Note heh!

[@iAmTheSquidThing]

What a lovely idea.

[@debashismondal7536]

hello, great video, to be honest numberphile is the reason i got interested in math

[@Malmaphazar]

Debashis Mondal same here, it made me realize that math is an exciting field with all kinds of discoveries to be made and beautiful geometries to be constructed and now I've applied to colleges for mathematics

[@nadzianyx]

Malmaphazar You're in for a really good time :)

[@lare290]

I was already kinda interested, but Numberphile really put the last nail in the coffin labeled "vocational school" for me. Now I am in gymnasium and I'm happier than I could have ever been fixing cars or shit.

[@luffyorama]

Numberphile and 3Blue1Brown lol

[@slendy9600]

Debashis Mondal no shame in that. schools typically do a terrible job of teaching math

[@aseq2]

How does this guy find all these everyday oddities! He's brilliant at this...

[@TheAngelsHaveThePhoneBox]

Oh, I had a toy like this when I was a kid! It was a wooden kite that climbed vertically on two strings you pulled in an alternating fashion. I've been always fascinated by it. Thanks for finally explaining it, Mr Tokieda!

[@InfraSolart]

This is the best analogy for AC to DC electricity conversion I've ever seen. I still think about this video all the time.

[@ReVoLynx]

This guy just keeps coming up with the most fascinating phenomenons about everyday objects, and its most intriguing! Big thanks to Tadashi, and keep doing what you do!

[@pedroscoponi4905]

Fun video with prof Tadashi as usual! :D So glad to see this in the subscription feed

[@shekelshlomostein4642]

FINALLY MORE TADASHI!!!!!!

[@ThatOverkillGuy]

i just want him to say oh my, at least once

[@OskarElek]

extraordinary!

[@elisnovat3955]

His voice does remind me of that Takai guy from star trek.

[@PedrinhoCruzeirense]

Tadashi videos are among the best videos on youtube. Ever. Congratulations!!!!

[@Melthornal]

This guy is one of the best guests. I'm not knocking other guests, because I love them, too, but there's just something about Tadashi Tokieda that is.. I don't know, comforting. I feel like watching his videos is some enlightening meditation. I come away feeling happy and relaxed.

[@NewcharTG]

Another video by Brady, The climber seems kinda shady. But the physics works out, And without a doubt, I will make it across to my lady.

[@GelidGanef]

A comment in limerick format? I believe it's the first time I saw that. While the comment's abnormal, I'm a sucker for formal Experimentation, and nobody's doormat. So you get a like.

[@Borednesss]

This is a fun comment chain. Forgive me as I struggle and strain To make up a poem, One that'll show 'em, That I can, too, use my brain...

[@oranjizer]

Ccccccccombo breaker !!!!!!

[@DaNameJeff]

Tadashi playing with string on his feet Nothing else can make me feel more complete Yea, I am a simple dude Just showing my gratitude Since I've been watching this clip on repeat Title: My Love for Tadashi

[@DaNameJeff]

Dude I just might comment on every video from now in limerick form xD haha it was fun :)

[@lineikatabs]

"That's strange" - everything you show us, Tokieda, is strange! And we LOVE it. Keep it coming! Thank you for being awesome.

[@eoghan.5003]

"that is rather strange"

[@deanc9195]

TADASHI!!! He is actually the best part of this channel

[@taschke1221]

Tadashi needs his own broadcast into our minds 24/7. First and foremost, to make us smile and laugh and, you know, all the invaluable knowledge that comes with him. Thank you sir.

[@seanalltogether]

The cartoon parts are threaded wrongly which made this a bit confusing. The cartoon has the threads going through the binder clips asymmetrically, whereas when shown in real footage they are going through symmetrically.

[@420thlegioner8]

0:04, what a great art

[@quinn7894]

Ikr? I would say it looks better than the animated toykieda.

[@kcwidman]

I think it's time for a new calculator unboxing.

[@adityakhanna113]

+

[@calvinhobbesliker2]

But why does it change direction when you thread it differently?

[@jerrr-c-squared]

calvinhobbesliker2 Because of the way the thread goes through the holes in the paperclip. Inside->outside vs outside->inside

[@CSDragon]

calvinhobbesliker2 look at the video thumbnail. notice how it is threaded. for both sides the string comes into the clip on the bottom side. that makes it go up.

[@calvinhobbesliker2]

Wow, congrats on the double racism.

[@matszz]

@@CSDragon the actual photage and the thumbnail differ from the animation in the video. I understand the general principle of friction, but the details are still somewhat fuzzy.

[@joenormanmusic]

This guy is a joy to watch. I dont know why.

[@nihonium]

i love the videos with Tadashi

[@abbaspetiwala7672]

In 2:32 I guess the string should overlap the left clip from top and go underneath from bottom. Coz this is purely symmetrical so how could the object move in only in direction.

[@anousenic]

The animation (e.g. at 2:30) is wrong and misleading. The thread is drawn the wrong way around on the left. It should be drawn *over* the metal on *top* and *under* the metal on *bottom*. So that left and right side are symmetrical. (so just mirrored, *not* mirrored and flipped) That wrong animation is also why I didn't first realize how it only works in one specific direction no matter the tilt. EDIT: As GarbageGamer74 pointed out the animation @ 3:03 shows (correctly) how it works.

[@djmips]

I contend that the animation @3:03 is also incorrect.

[@anousenic]

djmips: how so?

[@djmips]

The string on the side that isn't 'captured' should be sliding relative to the clip. It's shown as moving with the clip. But I can see clearly from the video that this 'sliding' side is actually moving down.

[@GarbageGamer74]

Oh, yeah, the motion of the clip relative to the string is poorly approximated by that animation. The threading topology is right at 3:03 but the motion is not really right. One side (the "captured" one as you put it) does not slide, while the other one does.

[@abbaspetiwala7672]

Yeah I saw that too.

[@mountain-roots]

To me, this was a perfect display of water currents. how water goes down a stream and fish ride the up flow up. Like Victor Schauberger described. Awesome!

[@quinn7894]

1:53 I've seen this video loads of times, but only now I see Toykieda winking.

[@idaho777]

At 2:10, the left string should be going into to the clip form outer bottom and exiting inner top.

[@periwinkle43]

I always love Tadashi's videos.

[@roderickwhitehead]

This is similar to how the proper spiking pattern on railroad crossties helps to resist rail from "running".

[@mathmachine4266]

Oh boy, I love videos where mr tadashi plays with school supplies!

[@Aziraphale686]

This guy is amazing, we need even more Tadashi.

[@tymo7777]

This man is fantastic...

[@unreal-the-ethan]

Tadashi Tokieda? On a video posted on my birthday???? This is a MIRACLE.

[@Folko]

Tadashi videos are the best things ever

[@ArvidOlson]

I didn't understand why which way the thread is threaded matters, is it the fibres in it or the shape of the clip or what?

[@bittenhare4493]

Yes I don't understand that either.

[@anousenic]

The Thread in the animation is wrong on one side. The left side has to be a mirror of the right side, so that both sides of the bottom thread enter the clip's holes from the outside.

[@gr-gx4zy]

I don't get it as well, need some detailed explanation I think. :D

[@djmips]

No the animation @3:03 is not correct.

[@GarbageGamer74]

The animation at 2:31 is wrong (in that configuration, the clip just follows gravity), but the animation at 3:03 is right. The string must be threaded as a mirror image, and it will go toward the direction that has the threads on the inside. I built my own version of this to confirm. Also look at the physical version at 3:13, you can see how it is threaded.

[@klankungen7794]

I love thees videos. my maths teacher in school told me that asians schools had extreamly good methods for teaching maths but didn't have much practical use of it while european schools have practical use of math in our school but the level of math is realy low. I always loved implementing logic in reality so Tadashi is my favourite person on numberphile :)

[@misterdeviouss]

I liked the video before even watching it You know you are going to amazed when its Tadashi .

[@shrewd407]

I subscribed to this channel just to keep watching Tadashi videos

[@samantony4423]

100% these are my favourite episodes

[@Drestanto]

The animation on 2:10 is not correct on the left string. However the 3:01 animation is correct

[@thesentientpotato3758]

Yay a Tadashi Tokieda video on my birthday :3

[@TyTheRegularMan]

You have no idea how much I appreciate the fact that your videos don't start with an annoying intro.

[@ChrisCanMakeStuff]

Tadashi Tokieda is my hero!

[@15october91]

I love this guy!

[@JBsoloman5000]

When I saw the thubmnail at first I thought "NEW PPAP VIDEO" Turns out to be even better...

[@fantasick8880]

Tadashi is my favorite mathematician on this channel. He's like a mathematician version of Michio Kaku.

[@Letrus100]

Looks at video feeds. Sees a Numberphile video. Looks at thumbnail, sees it's Tadashi. Instantly Clicks video and likes.

[@40GallonTophat]

This dude is my favorite. He's a great teacher!

[@ReubenMason99]

I love these videos

[@danielrhouck]

Thank you for having the passenger safely land after dropping the gondola.

[@Austin101123]

I love George Tokieda's videos!

[@sotiriospallis6219]

There is one detail that I don't think he really mentions, it's that if you want the clip to move away from you, the "ropes" must pass throught the metal holes from the outside part of the clip towards the inside, whereas if you want it to come towards you, you should pass the ropes from the inside of the clip towards the outside part. If you pay close attention you can notice that that is what really changes when he takes the rope and puts it down on the opposite side. I hope I am making sense :P

[@jawwad4020]

Love how he always makes it look like magic!

[@elisnovat3955]

lol, I think in every video I have seen he gets his feet out and uses them. I don't understand all the jargon exactly, but my layman understanding of this is basically that when the metal ring area turns in the thread it is able to latch onto the thread because of this more intense angle, where as the angle on the other ring side is less intense and thus slides more than grabs.

[@cetyl2626]

I had a toy like this when I was a kid! It was a wooden bear. It made me ponder how it worked. Thanks for doing a video on it!

[@FelipeZucchetti]

thanks for your advices professor...the "draw pictures" tip was perfect...

[@DanTheStripe]

Tadashi Tokieda is my spirit animal.

[@jpvillaseca]

Outstanding animations!

[@worf7271]

Tadashi is the best

[@knight_lautrec_of_carim]

loving his accent very pleasant to listen to

[@eantropix]

Watching one of his classes must be a blast

[@nayutaito9421]

I thought the video title was "Binder Clip Number" because this is a Numberphile video. I didn't expect no maths in Numberphile!

[@gabor6259]

HE DID IT AGAIN!!!!! He took his socks off! This man has a toe and is not afraid to use it.

[@0LoneTech]

The 2:23 illustration is wrong; the string on the left side should go over the side and under the top of the clip's ring (or, from the bottom, through the ring from the outside, just like the right string). As drawn, it requires a strong vertical kink, and the illustration is supposed to show how it can go through while barely touching the ring. The illustration at 3:00 is correct (but missing the string pulling part, making the pattern on the strings misleading).

[@cameron.johnson]

I love this guy.

[@Pootypatooty]

I love these videos, keep up the good work! :)

[@locust76]

Ingenious, practical demonstrations? Check Deep, silky smooth Japanese baritone? Check Tadashi Tokieda is awesome! Oh my...

[@johnbouttell5827]

people wrestling and I thread it through 0:02abandoned really by the quickies 0:04carrying a passenger underneath 0:05let's say that he's a top of rounding 0:08and we are designing a particular i

[@kurtu5]

What are the odds that I woke up today with the word Funicular stuck in my brain and was uttering it under my breath all day and this video comes out about them?

[@vanhouten64]

Scaled up to a very large size, this method could be used to launch satellites into orbit. Simply suspend two very long cables from a satellite in orbit down to the earth, and then use the cables as a space elevator via the method demonstrated in the video.

[@TuningPV80cc]

Love those robot animations! :)

[@timothymckane6362]

Mathematical sensai is back at last!

[@shawniscoolerthanyou]

I didn't know there was a debate about which channel to put this on but the answer is simple, subscribe to both Numberphile and Sixty Symbols. Problem solved, and that one was on the house.

[@listofromantics]

This cat Tokieda's voice is dope!

[@MrCyanGaming]

If you're reading this, have a Great day! 😄😄😄

[@unclvinny]

If you're reading *this*, you too!

[@hyperbolicparaboloid2818]

If you're reading this, note that the above people are idiots.

[@Robstar100]

If you're reading this you will die in at *MOST* 120 years. The clock's ticking.

[@niboe1312]

Stop putting so much pressure on me! What if I mess up and have a bad day?

[@gold4963]

Oh great, now you're on Numberphile... Dude, these are getting repetitive.

[@tamas5931]

Very interesting! I was not expecting the foot.

[@KeyMan137]

Everyone loves Tadashi!

[@VaibhavChimalgi]

Mr Tokieda should start a toy company and make cool toys for kids and grownups.

[@obaidmohammedamjad7126]

awesome video maan

[@pablogriswold421]

I went on to watch something else. To hell with whatever that was; Tadashi is the living God of Numberphile.

[@BC3012]

whoever chooses the thumbnails for this channel, you have me giggling every time!

[@VikingPickles]

It's funny because it's not even close to the first time I've seen this man's bare feet.

[@krakenmetzger]

I thought I would go an entire day without seeing Tadashi's feet. I was wrong

[@AmanNidhi]

this should be in Physicsphile!!

[@victorespinoza6210]

Mr. Tokieda is a wizard.

[@c.c.s.1102]

Dr. Tokieda is very humorous.

[@picknikbasket]

Amazing! I wonder if Prof Tokieda has enough material for a book - I'd be rushing to purchase that

[@BillM1960]

Brilliant vid.

[@Drachenbauer]

I know this same principe with little toy figures, that have two drill holes in their hands slightly tilted towards each other at the top. And they worpk even if the string is not a loose loop. It can be two strings knotted tight to the ends of a little horizontal bar at the top point. And it works if the strings are almost vertical. I´m pretty sure i saw this somehow that it looked like theese classic autumn decoration kites, cut out of a wooden plate and with theese holes for the string close to the side corners.

[@JohnDCrafton]

Tadashi = instant like

[@daniellasullivan6398]

I don't think the engineers will accept this solution *robot aggressively extends arms

[@mancheaseskrelpher8419]

Looks like we're back with Physicsphile. Or Sixty Numbers, maybe?

[@jfrio]

Very cool video, just a small nitpick: I'm pretty sure static and dynamic friction play no role here. Friction is proportional to the contact force, which is larger when the string wraps around the clip, no need for fancy phenomena.