This Week: Scraps of ancient textiles found
In the News: Traumatic brain injury
Fingernails are essentially flattened versions of claws, and they evolved in all primates — including humans — to support broad fingertips, says UW-Madison anthropology professor John Hawks. Monkeys, apes and lemurs spend a lot of time in trees, and broad fingertips help give them the strong grip needed to climb trunks and hang underneath branches. [...]