BBC – Earth – We have known that Earth is round for over 2,000 years

Long before anyone circumnavigated the globe or went into space, the ancient Greeks had figured out that the Earth is ball-shaped, rather than flat. The well-known rapper B.o.B has been on a mission to convince his Twitter followers that the Earth is flat.  How can a 16-mile distance between two points in a picture look flat, he questioned: […]

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