It's meant as a joke, but unfortunately it's not. Two thousand years after Eratosthenes of Cyrene first calculated the circumference of the Earth, in a time where tourist space travel is almost a reality, there are still people who believe the Earth is flat. These so called “flat earthers” believe the Earth is a disk, covered by a gigantic dome, with the Sun and the Moon rotating in circles above it, and with Antarctica being a gigantic ice wall (just like in Game of Thrones), going all around the edge of the disk. Gravity doesn't exist – the disk is...
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