Watson-Watt, Sir Robert Alexander (1892-1973), a British physicist. He developed the first successful radar system, which he demonstrated in 1935. It grew out of a radiolocator device, used to track thunderstorms, that he built shortly after World War I, while assigned to the Royal Meteorological Office's Radio Research Station. Watson-Watt was born in Brechin, Scotland. He was knighted in 1942.
He's ventured to the abyss of black holes, wagered on the information paradox and floated around in zero gravity. Meet the man, the legend, the super scientist: Stephen Hawking.
He is famous for a phrase he never said, for wearing turtlenecks and for hosting the original 'Cosmos' TV series. As enthusiastic about the stars as he was about marijuana, Carl Sagan led a very surprising life. Here are 10 cool facts.