These Rocks Look Like They Could Topple at Any Moment. They Hold 1,000 Years of Earthquake Secrets.

Stacks of perfectly balanced large rocks in Israel's Negev Desert appear to defy gravity, but a good shake could send them tumbling. So, researchers are examining them to learn about earthquakes that have struck this region over the past millennium.

from Live Science http://bit.ly/2U89V6G
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