According to other research, an ungroomed eyebrow can contain as many as 550 hair folicles, which would mean 1100 total hairs!
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The average person has approximately 250 hairs per eyebrow. According to Bosley the hair transplant company. They do eyebrow transplants as well and I'm sure they have done some research on this.
Well, a lot of factors contribute to the colour of peoples hair, E.G. Parents hair colour, where they live, etc. I reckon that the same amount of people have brown hair as the amount of people who...