Charles Darwin’s theory of evolution, first published in “On the Origin of Species” in 1859, has been scrutinized for over a century now – but the evidence is right in front of you, on your own body.

Goosebumps, for instance, are an evolutionary leftover from when we were covered in hair. The tiny muscle contractions that cause goosebumps cause hair to stand up, and out, away from the body.

When we had thick body air, this created better insulation. In the same way, when we get goosebumps when we hear something in the middle of the night, that reflex would have resulted in our former body hair puffing out – like an angry cat.

The following video offers other examples of evolutionary evidence. Most notable is the palmris longus – a long vestigial muscle in some people’s forearms. Though it’s disappeared from 85-90% of people, some people still have it. To check, simply lay your arm flat on a hard surface, touch your thumb to pinky, and curl your wrist up.

If you have the evolutionary holdover, you’ll see a tendon in the middle of your wrist. This has nothing to do with strength – it’s simply an evolutionary leftover if you still have it.

Check out this video for other sign of human evolution that may still exist in your body: