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How do Flat earthers explain manhole covers?

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redredred · M
Fun fact: the first man-made object yo orbit the earth was not Sputnik. The first item launched into orbit was a manhole cover placed directly over an underground nuclear text in the American southwest a few months before Sputnik. They had hoped to recover it to see how radioactive it became but they underestimated the blast force.
BlueVeins · 22-25
@redredred at mach 172, no less!