By 1905, college football had become so violent that which U.S. president urged rule changes?

Which Russian author and playwright wrote hundreds of short stories, including "The Steppe"? In 1897, many of Seattle's police officers and firemen quit their jobs to join a gold rush in which Canadian region? Which German engineer had perfected his alternative to the Otto gasoline engine by 1897? Which American writer settled in France in 1903, where she was later joined by Alice B. Toklas? Which merchant's company owned hundreds of stores bearing his name across the U.S. by 1912? 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?