Dr. Sydney W. Britton of the University of Virginia kept chimpanzees around the house. He treated them well and grew quite fond of them. His object: to learn from the chimps why their distant human cousins have big brains and walk on their hind legs. Last week, at a meeting of the National Society for Medical Research in San Francisco, he told his theory:
The Britton chimps normally walked on all fours, standing upright only when excited or when they wanted to look around. But they could be made to stand upright for as...