Unsolved secrets of mankind, which science cannot explain

НOn our planet there are many amazing mysteries and strange secrets that have been preserved for many centuries. Surprisingly, despite the rapid development of science and technology, there are still many mysteries in the world that man cannot solve until now. We present to you 10 strangest puzzles on the Earth about which topsweet.ru writes.

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Klerksdorp balls are found in South Africa in mines. The origin of them is unknown. Their diameter is 2.5 cm. It is clear that someone worked them, because they are engraved with three furrows. The age of the rock from which the ball is made is 2.8 billion years.

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