Are these remarkable stones natural, or proof of an ancient advanced civilization?

Skeptoid #894: The Klerksdorp Spheres

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The story goes that this stone covered with Viking runes was found in a Minnesota field in 1898. Its true history is much more interesting.

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Was the SARS-CoV-2 virus of natural origin, or was it engineered in a Chinese research lab?

Skeptoid #894: The Klerksdorp Spheres

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