Becky asks: When did women start growing out and painting fingernails? On humans and other primates, nails are a flattened version of a claw which likely developed to aid in gripping and climbing. However, they can also act as a visible “health report.” Someone in poor health, or infected by a fungus, might have yellow, brittle nails, while someone in … Continue reading When Women Started Growing Out and Painting Their Nails