WEBVTT - BrainStuff Classics: Why Do We Have Eyebrows?

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<v Speaker 1>Welcome to brain Stuff, a production of iHeart Radio. Hey

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<v Speaker 1>brain Stuff. Lauren bog Obam here with a classic episode

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<v Speaker 1>from our erstwhile host, Christian Sagar. This is what I've

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<v Speaker 1>been thinking about because of all the time I've been

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<v Speaker 1>spending when I am out in public interacting with people

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<v Speaker 1>who are wearing a covering over the lower half of

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<v Speaker 1>their face. The question of the day is why do

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<v Speaker 1>we have eyebrows? Hey, brain stuff? It's Christian Saga, and

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<v Speaker 1>I'm here to tell you why human beings have eyebrows,

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<v Speaker 1>because look at them. Take clus look, go over to

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<v Speaker 1>the mirror. Look, aren't they just ridiculous? I mean, they're

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<v Speaker 1>also very well manicured, but they're also ridiculous. Now, scientists

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<v Speaker 1>aren't entirely sure why we have this hair, but they

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<v Speaker 1>have a pretty good guess. The arch shape of the

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<v Speaker 1>eyebrow diverts rain or sweat around to the sides of

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<v Speaker 1>our face, keeping our eyes relatively dry, and the most

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<v Speaker 1>obvious advantage of this is that it allows us to

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<v Speaker 1>see clearly even when we're sweating a lot. Diverting the

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<v Speaker 1>sweat away is also good because the salt in sweat

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<v Speaker 1>irritates our eyes. But just to test things. I shook

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<v Speaker 1>a salt shaker into my eye and take it from me.

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<v Speaker 1>It burns like hell fire. Eyebrows are a very significant

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<v Speaker 1>aspect of our appearance. They are one of the most

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<v Speaker 1>distinctive features that make up our faces, and we pay

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<v Speaker 1>a lot of attention to them and look. Eyebrows are

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<v Speaker 1>also one of the most expressive facial features. One of

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<v Speaker 1>the clearest ways we're telling somebody what we're thinking is

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<v Speaker 1>to simply move our eyebrows up and down. But what

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<v Speaker 1>if we didn't have eyebrows. Scientists have thought about this

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<v Speaker 1>as well, and they think that if we didn't have eyebrows,

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<v Speaker 1>we would have gotten instead these long snuffle luck bagus

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<v Speaker 1>style eyelashes, as well as far protruding foreheads, which could

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<v Speaker 1>have been kind of useful because we could put things

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<v Speaker 1>up there I don't know, like like our keys, but

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<v Speaker 1>rain or sweat would then drop from that ledge on

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<v Speaker 1>our face straight away down onto the rest of our

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<v Speaker 1>face without getting into our eyes. So all right, way

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<v Speaker 1>to go, evolution for not making us look like that.

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<v Speaker 1>Today's episode was written by someone I could not figure

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<v Speaker 1>out who, but it was produced by Tyler Clang. For

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<v Speaker 1>more on this and lots of other topics. Is it

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<v Speaker 1>how stuff works dot com brain Stuff is production of

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