3Why Do Your Fingers Prune When You Take a Bath?
Everyone knows how to tell when bath time is over: you suddenly notice the bath's gone chilly and the whiskey bottle is empty. However, when we were younger, there was a slightly more liver-friendly way to know when to get out of the tub: when your fingers started pruning. As a kid, you probably just assumed this was the first sign that your body was about to start melting. And for the longest time, science's answers weren't much less stupid.
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"Melting? Fine. Sure. Whatever. Now can you excuse me? I've got stuff to grow on rats' backs."
However, it looks like they've finally cracked this particular nut: A new theory suggests that pruning not only has a function, but is a straight-up evolutionary advantage that allows us to grip wet items more tightly. You may have noticed that the wrinkles that form on your fingers resemble treading on tires and other high-friction materials. The point of treading is to increase surface area and thus friction, and that's what scientists think pruning does, too.
In the modern world, this helps us with holding on to the soap and, well, that's basically it. But back in caveman days, pruned fingers may have been a huge survival advantage for our ancestors living in wet and humid climes. The extra gripping power provided by nutsack-textured fingers meant they had a surer grip on the spears and other weapons they used to fend off hungry beasts.
Keeping their precious genes safe so that future generations might masturbate in the shower more efficiently.
The pruning response doesn't work with fingers where the nerve had been severed, which heavily implies that pruning is an intentional response from your central nervous system, which knows a thing or two about keeping your ass alive.
2Why Do You Always Pee More When It's Cold?
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Ever come in from a hot day to a cold blast of air conditioning and immediately have to piss? Or jump into a swimming pool full of cold water and start peeing your little heart out, even though you didn't have to go before you dove in? If you've never noticed it before, you will now -- it's a known scientific phenomenon. So enlighten us, science: Why do we pee more when it's cold?
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And could you sum it up quickly? We're about to pop over here.
It's all because of the cold diuresis phenomenon, which increases your urge to pee at an exponential rate as the temperature drops. The colder it gets, the harder the piss seems to push against the inside of your organs. It's hard to ascertain why it is that the bladder goes into overdrive when the temperature dips, presumably because nobody capable of finding out cared all that much, but the leading theory has to do with how when you're cold, your blood vessels shrink, especially in your extremities.
As a consequence, blood tends to draw deep within the confines of your body, where it can remain nice and toasty and let the appendages deal with that whole "freezing" thing. A side effect of blood's retreat tactics, however, is that all the scrunching of veins and arteries drastically drives up your blood pressure. This sends the kidneys into full alarm, and they try to compensate by dumping water.