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Funny, but I bet this is exactly the way flat earthers argued earlier in history - "Everyone knows the Earth is flat! Unless you're a trained natural philosopher, keep your mouth shut!" Questioning 'facts' is only natural, and right. You should only take as fact that which you are ready to accept - what you've verified, however inexpertly, on your own.

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Actually, that entire story is a myth invented in modern times to paint ancient thinkers as "backwards." And I quote:

The myth that people in the Middle Ages thought the earth is flat appears to date from the 17th century as part of the campaign by Protestants against Catholic teaching. But it gained currency in the 19th century, thanks to inaccurate histories such as John William Draper's History of the Conflict Between Religion and Science (1874) and Andrew Dickson White's History of the Warfare of Science with Theology in Christendom (1896).

Experts have known that the earth is round since the ancient Greeks. It has only been amateur uneducated "experts" claiming otherwise since then.

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