Name: Super-fast way to tie Shoelaces - Numberphile
Uploaded: 2020-03-30T06:35:46.000Z
Duration: 3 min 15 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Alright, we're gonna do some street maths

Now, most people would mess around doing some kind of complicated knot,

Grab the two sides, pass 'em over, boom! There's your knot.

I'd heard about it, you know, on the maths circuit.

People would discuss the way that you tie your shoes, right?

And so – I know it's been around for a long time, I know it's been passed down

But I'm not familiar with the earliest case, and I have heard names assigned to it,

but I've not come across any one that particularly sticks.

I just call it "that brilliant way to tie your shoes."

(Brady) Be honest with me, is that how you do your shoes?

Once it's done, it looks exactly the same, right?

So then people won't go, "That's an unusual knot," right?

It's like they've seen a magic trick, right?

They can't comprehend how a knot can happen so quickly.

But, I'm not startled; I'm a mathematician!

Okay, you go from completely undone, it starts the same way as a normal knot

It has a minimum of three crossings in that particular knot

You get one shoelace that's coming out the back

You fold it forward and you hold it on its way down

So it goes up over the loop and then down

This one curls back in the opposite direction

And then all you do is you take this one on the way down and put it under that loop

At the same time as taking this one and putting it under that loop

And then you swap them over to the other hands

And then you pull them tight, and that is your knot!

Once you tighten it, hold them on the way down,

So the one that comes out the back, you fold it forward into a loop

So it goes up and then on the way down you're grasping it

So it starts at the front, curls back, hold it on the way down

Now you're gonna take this lace, put it under that loop

at the same time as taking this lace and putting it under that loop

People tie their shoelaces, they get one and they loop the other one around

and they pull it through, which is the normal way.

Although I've noticed, of course, Brady wears slip-ons.

For those of us who have entered adulthood

But, the thing is, you end up with a knot that holds your shoe on.

Formed with what ordinary people would think is a knot

Now, nothing of this is a mathematical knot

If it has loose ends, you can, in principle, untie it

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Super-fast way to tie Shoelaces - Numberphile

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