Forget Columbus: The Ancient Greeks Who Proved Earth Was Round

Here’s a history bomb for you: Ancient Greek mathematicians knew the Earth was round—and even calculated its size-over 2,000 years ago. Pythagoras suggested it in 500 BC, and by 240 BC, Eratosthenes not only proved it was a sphere but measured its circumference with incredible accuracy using just a stick and some shadows. Columbus read their work centuries later.