From an evolutionary standpoint, eyebrows help keep debris from entering our eyes, and they provide some shelter from the sun’s rays by attracting light, in the same way as a football (or other outdoor sport) player may smear black greasepaint under their eyes.
From a fashion standpoint, unibrows have historically been considered a sign of beauty throughout much of the ancient and modern world, particularly in the areas between North Africa and Central Asia (especially in places with historic Persian influence), and in some of those places, it is even preferable for women to have moustaches and/or beards.
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