"Instead of a frail scientist, I met a deep chested man with a resonant voice and hearty laugh. Long hair framed his marvelous face in a kind of leonine mane. He wore slacks, a grey sweater with a fountain pen stuck in its neck, black shoes and no socks. When President Roosevelt once asked him at the White House about this habit, he said 'when I was young I found out that the big toe always ends up making a hole in the sock, so I stopped wearing socks." (Philippe Halsman)