Your Amazing Body
Reader's Digest UK|February 2020
Your fingerprints can predict some health issues. Looking at the sun can make you sneeze. You grow a new skeleton every ten years. Science hasn’t uncovered every mystery, but what it has discovered will blow your mind
Ashley Lewis
Your Amazing Body

Science knows why...

1 You get goose bumps.

When you feel a chill or see something scary, your body releases a surge of adrenaline. The point is to make your body hair stand up—which helped our animal ancestors stay warm and also made them look larger in the face of predators. Getting those individual hairs to stand to attention requires the teeny skin muscles at the base of each follicle to contract, making your skin look vaguely like a goose’s post plucking—hence, goosebumps.

2 You grow wisdom teeth.

Wisdom teeth are actually a third set of molars. They allowed our forebearers to munch on rough food such as roots, nuts, and meat, especially when other teeth fell out (alas, our ancestors had poor oral hygiene). About 35 per cent of people never develop wisdom teeth, partly because of an evolutionary shift that means the human jaw is often too small for them. The rest of us start developing them by age ten, though they don’t fully emerge until young adulthood, which is when we (allegedly) acquire some wisdom.

3 Your fingers and toes wrinkle in water.

When you’re in the bath, water seeping into your skin makes the upper layers swell. That causes the blood vessels below to constrict, which in turn causes some of the upper layers of skin to collapse. The irregular pattern of swelling and falling skin is what we see as wrinkles on our fingertips and toes.

4 Your knees crack after sitting for a long time.

Diese Geschichte stammt aus der February 2020-Ausgabe von Reader's Digest UK.

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Diese Geschichte stammt aus der February 2020-Ausgabe von Reader's Digest UK.

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