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why do we have eyebrows

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Scientists aren't entirely sure why we kept this hair, but they have a pretty good guess. We know that eyebrows help keep moisture out of our eyes when we sweat or walk around in the rain. The arch shape diverts the rain or sweat around to the sides of our face, keeping our eyes relatively dry. The most obvious advantage of this is that it lets us see clearly when we're sweating a lot or out in the rain. Without eyebrows, getting around in these conditions is a little more difficult. The shape of your brow itself diverts a certain amount of moisture, but eyebrows make a significant difference in your ability to see. Diverting the sweat away is also good because the salt in sweat irritates the eyes, making them sting a little.

http://health.howstuffworks.com/human-body/systems/eye/question520.htm
 
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Scientists aren't entirely sure why we kept this hair, but they have a pretty good guess. We know that eyebrows help keep moisture out of our eyes when we sweat or walk around in the rain. The arch shape diverts the rain or sweat around to the sides of our face, keeping our eyes relatively dry. The most obvious advantage of this is that it lets us see clearly when we're sweating a lot or out in the rain. Without eyebrows, getting around in these conditions is a little more difficult. The shape of your brow itself diverts a certain amount of moisture, but eyebrows make a significant difference in your ability to see. Diverting the sweat away is also good because the salt in sweat irritates the eyes, making them sting a little.

http://health.howstuffworks.com/human-body/systems/eye/question520.htm

Whoopi Goldberg seems to get along fine without them.
 
Do any other animals have eyebrows? Not simply hair above the eyes, but raised hair that they can control voluntarily?
 
i can't figure out why,

to keep shit out of our eyes (lids and such)?

giraffe neck evolution

to give eyelash mites a place to vacation in the summer.

They also help to keep dust and stuff out of your eyes. If you notice the recessed concave curve of the eye, the brow is the first buffer, then the lashes, then the lids.

Also the small amount of static electricity generated by the body localizes in the hairs creating a passive attraction effect for any dust particles that might have floated toward the eye. It's really ingenious when you think about it.
 
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