Why do we have eyebrows? What is there purpose other than for expression.?

Question

I understand that Darwin did and exparement and as I understood it we have eyebrows only for expression, there has to me more to it.

Answer 1

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.

There are a number of ways these qualities might have helped early man survive. Being able to see more clearly in the rain could certainly help you find shelter, and there are several circumstances when keeping the sweat out of your eyes could save your life. If you were trying to outrun a predator, for example, it's a good bet there would be a lot sweat running down your face. If all that sweat flowed right down into your eyes, you wouldn't be able to see that well, and your eyes would be irritated, which would certainly impair your ability to escape! Because of this slight survival advantage, nature would most likely select for humans with eyebrows over humans without eyebrows

Answer 2

All mammals have eyebrows, of which THEIR primary purpose is to reduce sunlight reflecting off your skin, which, in prehistoric times, was critical if you were chasing after your next meal (you wouldn't want to be blinded by sunlight, would you?). It also helps focus light into our eyes, much as our ears help focus sound into the ear canal; it is also partially why the eye is recessed. It also keeps sweat out our eyes.

However, all of these possibilities had greater relevance when our ancestors had far-sloping foreheads, which were more pronounced than they are, today. Thus, our need for such, today, is vastly reduced (i.e., we have sunglasses, sweat/headbands, towels, binoculars, etc).

And, of course, where would Mr Spock be without his signature eyebrow raise, but, then, he is only half-human, so there may be a different evolutionary theory, there, right? ;)

The first link below sheds a little more light on the subject (pun intended!), and the second link is from a similar question asked on this site.

P.S. The word is "experiment", but I'll give you a point for even knowing who "Darwin" is! ;)

Answer 3

1

Answer 4

When sweat drips down our fore heads they stopsweat going into are eyes

Answer 5

To stop sweat from your head to go in your eyes =)

Answer 6

I think they help keep sweat out of your eyes.....or something along those lines.

Answer 7

Well, have you ever thought about how funny you'd look without them?

Answer 8

So we don't look so dumb i guess.