Henry Morton Stanley in Denbigh (a statue of Stanley with an outstretched hand). Taxa named in honour of Stanley include: Henry Morton Stanley Sir Henry Morton Stanley (born John Rowlands; January 28th, 1841 – May 10th, 1904) was a Welsh journalist and explorer who was famous for his exploration of central Africa and his search for missionary and explorer David Livingstone. Upon finding Livingstone, Stanley reportedly asked, "Dr. Livingstone, I presume?" Stanley is also known for his search for the source of the Nile, his pioneering work that enabled the plundering of the Congo Basin region by King Leopold II of Belgium, and
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