Which American astronomer discovered Pluto in 1930 at Lowell Observatory?

Which Russian-born gangster, a childhood friend and partner of Bugsy Siegel, became known as the "Mob's Accountant"? By age 25, J. Robert Oppenheimer had published many papers in which then-new field of physics? Artem Mikoyan and Mikhail Gurevich produced the first of which Soviet fighter planes by 1940? By 1942, FDR had appointed seven new members to which body, getting the "packing" he wanted after his 1937 plan failed? Which group of nine Black teenagers was falsely accused of a crime in Alabama in 1931, leading to landmark Supreme Cour… By 1959, after just 11 years in business, which company was the world's leading motorcycle manufacturer? By 1962, which fluoride toothpaste had become the best-selling toothpaste in the U.S.? In 1965, which muscular Austrian teenager won the title of Junior Mr. Europe?