Ancient archaeological sites across the Northern Hemisphere have been littered with a mystery. Where there were hominins, there too could often be found roughly rounded spheres of stone. Some have been dated back to over 2 million years ago, with marks suggesting that the balls had been deliberately shaped.
New research has discovered a plausible purpose for these strange tools: Our ancestors could have been using them to smash open bones - to get to the nutritious marrow inside.
An international team of researchers led by archaeologist Ella Assaf of Tel-Aviv University in Israel made a close examination of ten such stones found at Qesem Cave, a Lower Paleolithic site occupied by early humans between 400,000 and 200,000 years ago.
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