Hi, we're here from Curiosity.com to help you get smarter in just a few minutes.

I'm Cody Gough.

And I'm Ashley Hamer.

Today, you learn about why you open your mouth when you do certain things with your eyes,

what to teach people if you want them to trust GMOs more, and why

sweat really is not detoxifying.

Let's satisfy some curiosity.

You know that face you make when you're putting in your contacts or applying eyeliner or

mascara. It's not just you. It seems like pretty much all of us open our mouths

when we're messing with our eyes. And while researchers haven't found one

definitive reason why we do this, there is a leading theory that's pretty compelling.

To understand so-called mascara mouth, you need to understand a few things about the anatomy of your head. The muscle mainly

responsible for opening and closing your mouth is called the lateral

teragoid and that's controlled by the central sensation highway known as the

trigeminal nerve. The muscle that lifts and

lowers your upper eyelids on the other hand has the Harry Potter-esque name of

Levator Superioris and that's controlled by the oculomotor nerve.

The trigeminal nerve and the oculomotor nerve

originate really close together in the brainstem.

The leading theory behind mascara mouth is simply a case of crossed wires.

When you activate the oculo motor nerve to keep your eyes open to apply

mascara or put in contacts,

...