From the brains behind brains on, this is the moment of um.

Answering those questions that make you go, um, um, um, um, um, um, Welcome to your moment of um from from APM studios. I'm Anna Goldfield.

Um.

When you look in the mirror, what do you see?

Eyes, a nose, lips, cheeks, chin, and two random caterpillars floating on your forehead.

Eyebrows. What are they doing there? Why is their hair above our eyes? Why do they move?

What is even going on up there? We've gotten a bunch of great questions about eyebrows, including this one. Hello, my name is Philip, and I'm six years old. And my question is,

how do eyebrows move? Some people argue that eyebrows might be important to stop sweat coming down over your eyes,

but they wouldn't be the shape they were or have the maneuverability that they have.

So we think it's much more to do with social things.

Our eyebrows are evolved and they function to tell other people how we're feeling.

My name's Penny Spikins.

I'm a professor of the archaeology of human origins at the

University of York in the UK. If you'd said to me, like, why do we have a nose or why do we have a

mouth or why do we have eyes, then we kind of know the answer to that, don't we? Like we see with our

eyes, we breathe with our nose, we eat with our mouth, but our eyebrows, they seem to come in a different kind of thing. We're not quite sure what

they are for. Well, as a scientist, what we do is we look at different clues from around the

world to try and understand this. And it's not immediately obvious.

And there are kind of three types of clues it's worth talking about.

One is looking at other animals around today and looking at their faces and trying to understand what that might have is.

The other is we can look at the fossil record for humans, for our ancestors.

And then we can also look at ourselves and look at what the science of what we do with our

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