What is the purpose of eyebrows?
They keep sweat from running into your eyes. Sort of an organic sweatband.
Richard E. Barrans Jr., Ph.D.
PG Research Foundation, Darien, Illinois
In humans... to prevent sweat and/or small foreign objects from falling into
the eyes, for sensing something before if enters the eye, to warn the person
that an insect is near the eye, along with other hair to indicate wind....to
help in the expression of feelings and on and on.
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Update: June 2012