A lock on a door, how old would you say you understand how that works?

I would say maybe like eight, nine out of ten, I mean, a key and a lock fairly straightforward

right?

So my understanding is you have the key that has a lot of different bumps and as you put

it into the lock, there are pins in a barrel and so as you put the key and the pins go

up and down and somehow, okay, I don't quite know how, but there's something that happens

with the pins moving and then you turn the key, I think, at least I thought I did, perhaps

I don't understand as much as I thought I did.

I guess I'll take my eight or nine down a few packs to like a three out of ten.

Yeah, I feel like I have a pretty strong grasp of how zipper works feels like a pretty simple

mechanism.

Can you put a number on it?

Ooh, maybe like a nine out of ten.

The way that a zipper works, how would I describe this?

Okay, there's two rows of teeth, they've got little noctis on them and then at the bottom

there's like little stoppers and somewhere along the bottom you've got a tab attached

to one side, somewhere inside of that tab mechanism there must be something that feeds

them together but I'm not entirely certain, yeah, I don't really know how that part of

it works, I guess, I guess I don't really understand it quite as well as I thought I did.

Now I'm kind of embarrassed that I said nine out of ten because I don't actually feel like

it's a nine out of ten, probably more like a four.

You just heard two perfectly smart people attempt to explain how a couple of seemingly simple

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