Eye color Health effects of sun exposure Human hair color Human physical appearance Human skin Race (human classification) References Further reading Summary of clues to the saga in which humans evolved to lose their hair and had to adjust, including turning from light skin to dark skin, together with an estimation of the time when humans invented clothing. External links "Key gene 'controls skin colour, BBC News. SLC24A5 gene controls up to 38% of the tonal range in people with mixed European and West African ancestry "The Biology of Skin Color: Black and White"—PBS "The Biology of Skin Color — HHMI BioInteractive Video"—YouTube Human genetics Human physiology color Skin physiology