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Trilobite!
www.nytimes.com
Ultimately, though, quartz is tougher than slate, and survives as pebbles long after the country rock has been eroded away. I would be willing to wager that some ...
Early humans developed sense of compassion long before we became...
www.dailymail.co.uk
Researchers speculate that by carrying the pebbles long distances, the early humans were displaying 'tenderness'. Move on 1.5 million years, ...
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