Hidden below the surface of California's Central Valley are pollen grains from the Pleistocene that are providing scientists with clues to the severity of droughts that struck the region between glacial periods.
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Ancient pollen reveals droughts between Sierra Nevada glacier surges
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Author Clint Nielsen
Clint is a dad and husband trying to stay in shape. He's also a highly opinionated fitness enthusiast and author of Reveal The Steel. Follow him on: Instagram, Twitter, Facebook and Google+