Tuesday, 14 February 2017

The structure and composition of eyebrows - Explaining those on fleek hairs above the eyes

First and foremost, they protect your eyes. The shape of the brow ridge and the brows themselves channel sweat, rain, and moisture away from the eyeballs so your vision stays clear. Second, they're essential for nonverbal communication. 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.As a species we humans rely on our sight more than any other sense, and water can seriously blur vision. Eyebrows may also deflect debris and shield our eyes from the Sun. So while we slowly evolved to lose most of our body hair, our eyelashes and eyebrows remained. An estimated 90% of your hair follicles are typically in the growth phase at any given point. The hair in your eyebrows just experience a shorter cycle length, about 4 months (compared to 3 years for the hair on your head). The length of your hair is basically capped by the time which it has to grow. For a healthy young adult, the average time for tweezed hair to grow back at full hair length is 56 days.

Information and statistics from:
http://www.sciencefocus.com/qa/why-do-we-have-eyebrows
http://health.howstuffworks.com/human-body/systems/eye/question520.htm
http://mentalfloss.com/article/58424/why-do-we-have-eyebrows

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