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why do we have eyebrows

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On a practical level, you'd think that this was the answer.

But, anyone who's done any form of endurance sport knows that, if that is their primary design purpose, they are flawed.

They don't keep sweat at bay for very long, so much so that lots of people add a smear of vaseline to them to increase there effectiveness.

Well, natural selection works by process of elimination. We have eyebrows not because it's the best design possible, but because people with no eyebrows presumably had an even worse flaw that led to their disappearance from the gene pool.
 
Because without eyebrows, we'd just be super intelligent, time/dimension traveling, mind reading, emotionless bald humans.

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All I know about eyebrows is that once in a while one hair will get ingrown and then you have to yank it out and for a second your whole forehead hurts and then you rub the spot where it was and suddenly it feels amazing and normal again.
 
Well, natural selection works by process of elimination. We have eyebrows not because it's the best design possible, but because people with no eyebrows presumably had an even worse flaw that led to their disappearance from the gene pool.

Thinking about it, as our ancestors lost their hair, retaining some on the brow probably allowed them to give visual cues and subtext from brow movement that would be harder to see without hair. Being able to express yourself more effectively is also a survival advantage.
 
We judge other peoples' motivations by their body movement, especially their facial expressions. Eyebrows can really highlight your expression.

Would be my guess.
 
Most animals don't sweat like humans, so they don't need eye brows. Dogs and cats, for instance, sweat through their paws, but is not their main way of cooling down. Humans main way to cool down is to sweat, which is why we have eyebrows, to keep the sweat out of our eyes.
 
So others can tell if you're surprised or not.

I know nothing about this but I wouldn't be surprised if there is some truth to this.
Eyebrows do offer a lot it determining a persons emotional state and interest, such features are desirable to understand each other and thus have stuck around. At least that is my thoughts.
 
Wikipedia said:
Joseph Jordania suggested that the primary evolutionary function of clearly visible eyebrows was safety from predators during the vulnerable nighttime sleep, when early hominid groups started sleeping on the ground, away from the trees. Stealth predators (like big cats) as a rule stop hunting if they notice that prey animals are watching them. Cheap plastic masks, placed on the back of the head, saved many human lives in India and Bangladesh, where man-eating tigers claimed many victims in Sundarbans national park.[citation needed] Many predators (particularly big cats) are very sensitive to eyespots, and all the big cats have eyespots on the back of their own ears. According to Jordania, at night, when hominid eyes were closed, the eyebrows, arched upwards, and eyelashes, arched downwards, formed clearly definable oval eyespots on a ‘sleeping’ human face, creating an illusion that the eyes were still open and watching (and therefore could deter predators from attacking sleeping hominids).[2]

Hmm.
 
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