Human has evolved to become less hairy in the past six million years or so, but we still have those clumps of fur above our eyes. Beyond their role in our facial expressions, eyebrows act like natural sweatbands, preventing rain and sweat from running directly into our eyes. Eyebrows then took on another function: communication. Facial expressions convey meaning and emotions in ways that are hard to fake, and the eyebrows exaggerate expressions. Even in cartoons, a simple line above the eyes is enough to denote anger, fear, or surprise in a face, and experiments have shown that we can recognize a familiar face more easily when the eyes are blanked out than when the eyebrows are.
Picture Credit : Google
