Humans are the only mammals with long hair on their heads. Scientists look into what drives this unique feature.

"There’s no magic trick to growing it past what your genetics allow." So save your money on those hair-growth supplements.

For the past five decades, Chertow, 75, has let his hair grow 10 feet long, as Syracuse.com first reported. He wears his hair in dreadlocks, but it drags on the floor if Chertow doesn’t wrap it ...