More Evidence That Dinosaurs Suffered a One-Two Extinction Punch What killed the dinosaurs?
That was a mystery for decades; when I was a kid, there were tons of ideas but precious little evidence for any of them, making them little more than speculation. In the late 1970s and early ’80s, though, the hypothesis was put forward that a giant asteroid or comet i...
More Evidence That Dinosaurs Suffered a One-Two Extinction Punch
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