What it’s about: That time that ferns completely upended all life on Earth. Azolla is a freshwater fern often used as fertilizer in rice paddies, but 49 million years ago, it spread so far, and ...
Kathleen Pryer is professor of biology at Duke University and president of the American Fern Society. Fifty million years ago, the Earth was so warm that turtles and alligators thrived in lush forests ...
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