This is the Hammer-Feather Drop in the world’s biggest vacuum chamber …though in this case, “the hammer” is a bowling ball. In this excellent clip from the BBC’s Human Universe: Episode 4, Professor Brian Cox visits NASA’s Space Power Facility in Ohio, home of the world’s biggest vacuum chamber, to test Galileo Galilei‘s Leaning Tower of Pisa experiment, circa 1589. “If you drop a brick and a feat