A new theory put forward by a team of researchers may indicate the use of stone weapons by ancient humans from nearly 2 million years ago. The round stones, first excavated in South Africa’s Cave of Hearths 30 years ago, have been analyzed by a team of archaeologists, kinesiologists and psychologists, bringing them to the conclusion that the stones may have been used as throwing weapons.

The 55 mysterious spheroids, each about the size of a tennis ball and dated to between 1.8 million to 70,000 years old, have been found to be just the right size, weight and shape, to hit a target about 25 meters (82 feet) away when thrown.
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