Christopher Columbus knew the world was round. It was common knowledge for several hundred years prior to 1492.
Below is a quote from the link provided.
"It must first be reiterated that with extraordinary few exceptions no educated person in the history of Western Civilization from the third century B.C. onward believed that the earth was flat.
A round earth appears at least as early as the sixth century BC with Pythagoras, who was followed by Aristotle, Euclid, and Aristarchus, among others in observing that the earth was a sphere. Although there were a few dissenters--Leukippos and Demokritos for example--by the time of Eratosthenes (3 c. BC), followed by Crates(2 c. BC), Strabo (3 c. BC), and Ptolemy (first c. AD), the sphericity of the earth was accepted by all educated Greeks and Romans. "
Ploppies in the 1400's believed the Earth was flat.
Ploppies in 2000 believe progressions will win at blackjack.
