Klerksdorp balls have a mysterious origin

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 ,