Adam Taylor

In fact, research shows that selfies on social media are much more likely to be left-sided than right-sided.

And also, interestingly, pictures of left-sided faces get more likes on social media because the left side of the face is more emotional.

Hi, nice to speak to you.

Inside us is an amazing machine, an amazing piece of art.

And almost none of us have any idea, really, what it's made of, how it works, how it was named.

So I wanted to bring it and its stories to light.

Well, goosebumps are made by tiny muscles in our skin called erector pili.

And these erector pilar muscles attach to hair follicles.

So when they contract, they pull the hairs up and away from the skin.

So the skin bunches up, making the goose flesh.

Hence erector pilar's name.

Pilar is hairs in Latin, and erector means how it sounds.

Something that erects things.

But the strange thing about our goosebumps is that they don't really have a function at all, other than to remind us that we're descended from animals.

Animals have hair that sticks up on end when they're scared or for protection, like a porcupine with its quills sticking up.

A porcupine's quills are actually hair.

Animals' hair also sticks up when it's cold to keep them warm, a bit like the way air inside a down puffer jacket insulates.

But our goose bumps are also triggered by terror and cold, but we don't have quills to protect us or a thick coat of fur to trap air for insulation.

So our goose bumps don't serve any purpose.

They're just a relic of our evolutionary past.