Christopher Columbus set sail on August 3, 1492.
And False, Christopher Columbus didn't prove that the Earth is round.
Kids in school have been long taught that when Columbus set sail in 1942o find a new route to the East Indies, it was feared he would fall off the edge of the Earth because people then thought the planet was flat. Nope. As early as the sixth century B.C, Pythagoras later followed by 2 people wrote about the Earth as a sphere, and historians say there is no doubt that the educated in Columbus's day quite knew that the Earth was round.
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