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Letter: The world is only one mistake away from another mass extinction
09282017 NUCLEAR TEST 1946
An underwater atom bomb blast is seen in the lagoon of the Bikini Atoll Islands on July 25, 1946. - photo by Associated Press
Dinosaurs ruled the earth for 150 million years, arguably the most successful species the planet has ever known. Then about 65 million years ago, the dinosaurs suddenly disappeared. What happened?