List of Famous people who born in 1913

Hartland Sweet Snyder was an American physicist who along with Robert Oppenheimer calculated the gravitational collapse of a pressure-free sphere of dust particles as described by Einstein's general relativity, and found they contracted onto a radial distance, the Schwarzschild radius. It was later interpreted as the particles ending in the particles disappearing beneath the 'event horizon' associated with a Black Hole singularity. In recent years, it was shown by Trevor Marshall that the particle trajectories end in a shell of infinite density at the 'event horizon' radius, supporting the shell collapsar as endpoint. Snyder’s argument that the “star thus tends to close itself off from any communication with a distant observer” which is quoted as an early inference of a Black Hole, does not follow from his model. Only the very surface of the infinite density shell could reflect or emit radiation and solutions without a density singularity are needed to investigate the issue.

Tahir Yahya (1916−1986) was Prime Minister of Iraq twice, from 1963 to 1965 and a short term in 1967-1968. He was educated at the Baghdad Military College and the Staff College. Born in Tikrit 1916. He was the 4th child to Mulla Yahya el-ogaily, a prominent tobacco merchant between North and Central Iraq. At the age of sixteen, he joined the Baghdad Teachers College, then became a teacher in Baghdad for one year after graduation. He then pursued further education in military sciences. He was a cavalry officer and played polo for the Iraqi army. He led the Iraqi armored company where he was wounded in the battle at the Kfar Masaryk, earning two medals bestowed by Crown Prince Abd al-Ilāh.