Why Do Africans Curl Their Hair?
Black hair curl phenomenon, like black nose thick, black and white, is the human body adapts its life the result of Africa's hot environment.
Curly hair can hold the air that is not easy to flow inside to prevent heat radiation.
Dark skin color can block the sun's ultraviolet (UV) damage to the human body (ultraviolet rays can penetrate the skin into the skin, causing cell damage and even DNA mutations-canceration).
Large nostrils can allow more air to enter the body, because the gas temperature is higher, the number of gas molecules in the unit volume is reduced, the oxygen molecule is reduced, only by inhaling a larger volume of air to ensure the needs of the body.