00:00Four interesting facts you didn't need to know.
00:02Number four, have you ever noticed that little round hole in elevator doors?
00:07Well, it's actually a keyhole that will open the doors if you have this special key.
00:11Number three, have you ever wondered why you can't tickle yourself?
00:15It's because what makes tickling effective is the unpredictability of the tickler.
00:20And because you can predict every move that you make, you can't tickle yourself.
00:24Number two, have you ever wondered why your skin wrinkles in the water?
00:28Well, it happens because the blood vessels under your skin get smaller.
00:32And some scientists think that humans evolved to have this reaction
00:36because it makes it easier to grip things while wet.
00:39Number one, why do grocery carts have these loops on them?
00:42It's so you can hang grocery bags with delicate items like bread and eggs.
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