12,000-year-old, doughnut-shaped pebbles may be early evidence of the wheel
The wheel was likely invented around 6,000 years ago, but a new analysis of curious rocks from Israel suggests that ...
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12,000-year-old stones could reveal roots of wheel technology, study suggests
When connected, they form a rudimentary wheel-and-axle mechanism that can spin fibers like wool or flax into yarn more ...