Klerksdorp balls have a mysterious origin : vimarsana.com

At first glance, the Klerksdorp balls appear to have been carved by humans. Found in the mid-20th century, they have perfect lines on their sides and look

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Klerksdorp , North West , South Africa , Ottosdal , Johannesburg , Gauteng , Bruce Kirkhorn , Society For The Rational Inquiry , University Of Johannesburg , Rational Inquiry ,