Niels Hendrik David Bohr was one of the foremost scientists of the 20th century. The Nobel prizewinning physicist was known for his development of the theory of atomic fission that led to the development of the atomic bomb. He was born on Oct. 7, 1885, in Copenhagen, Denmark. His father, Christian, was a professor at the University of Copenhagen and his brother, Harold, was a great mathematician. He entered the university in 1903. In 1907, he earned his PhD went to England to study with J.J. Thomson and Ernest Rutherfurd. He returned to Copenh ....