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Why do our fingers wrinkle in water?
Thanks for asking.
We've all experienced that strange sensation of stepping out of the bath or swimming pool and noticing grooves which have formed on the tips of our fingers.
Have you ever wondered why that happens?
It's not just because our skin absorbs water and swells up, as you might think.
It's actually also down to our nervous system being at work, causing our blood vessels to constrict.
So what's happening is that the blood vessels in our fingers narrow down, making our fingers shrink in size, while the skin remains the same.
As a result the skin wrinkles and those grooves appear.
It's all controlled by our nervous system.
Actually it may do.
Think of it like the grooves on car tyres.
They help with better water drainage, thereby giving us improved grip on wet surfaces.
That's according to a study from Newcastle University which was published in Biology Letters back in 2013.
The researchers behind the study had participants move objects from one hand to the other through a hole, first with dry fingers and then with wet, wrinkled fingers.
And guess what?
The process was around 12% faster with wrinkled fingers.
So the next time you pick up a bar of soap with wet hands and wrinkled fingers, pay attention to how it doesn't slip in your fingers as easily as usual.
It's all about that better grip on wet objects.
Well, the Newcastle University study suggests it's likely an adaptation from our ancestors who roamed the earth on all fours.
Wrinkled toes might have helped them navigate wet terrains more effectively.
Not all scientists agree on this theory though.
Some argue that it's just a random trait rather than a survival advantage for our species.
In fact, some researchers think it's a bit too simplistic to link finger and toe wrinkling directly to survival.
They point out that humans have long developed tools for specific tasks like fishing, making finger wrinkling less crucial.
Plus, our primate relatives tend to avoid water altogether, so the benefits of wrinkled fingers might not apply to them.
There you have it.
Now you know why our fingers wrinkle in water.
In under three minutes, we answer your questions and help you understand the true meaning behind the trends, concepts and acronyms that are making headlines.
Listen along and you will really know for sure.