At the Paris Observatory in the 1670s, observations led to the first estimate of the speed of what?

At the Olympics, a race of about 437 yards equals how many meters? At the opening of the 1952 Helsinki Games, which winner of nine Olympic gold medals carried the torch into the stadium? At the opposite end of the visible spectrum from ultraviolet lies which kind of radiation? At the Panthéon in Paris in 1851, which physicist demonstrated the Earth's rotation with his famous pendulum? Disney's 2000 update of which 1940 animated classic kept just one segment from the original, Mickey Mouse's "Sorcerer's… At the 1904 St. Louis World's Fair, which Apache leader signed and sold autographs? When it merged with Tanganyika in 1964, which country was then the world's last alphabetically? At the time of her 1937 disappearance, which aviator was married to publisher George Palmer Putnam?