Stanley and Livingstone Stanley and Livingstone Stanley and Livingstone is a 1939 film directed by Henry King and Otto Brower. It is loosely based on the true story of Welsh reporter Sir Henry M. Stanley's quest to find Dr. David Livingstone, a Scottish missionary presumed lost in Africa, who finally met on November 10, 1871. Spencer Tracy plays Stanley, while Cedric Hardwicke portrays Livingstone. Other cast members include Nancy Kelly, Richard Greene, Walter Brennan, Charles Coburn and Henry Hull. Henry Stanley is a fearless newspaper reporter ready to do whatever it takes to get a story, regardless of any danger to his life.
19th century in science later in the 19th century by the German mathematician Bernhard Riemann; here no parallel can be found and the angles in a triangle add up to more than 180°. Riemann also developed Riemannian geometry, which unifies and vastly generalizes the three types of geometry. The 19th century saw the beginning of a great deal of abstract algebra. Hermann Grassmann in Germany gave a first version of vector spaces, William Rowan Hamilton in Ireland developed noncommutative algebra. The British mathematician George Boole devised an algebra that soon evolved into what is now called Boolean algebra, in which the only numbers were