The Atlantic covers Ken Caldeira's work on cyclical mass extinctions

A pair of researchers have new evidence to support a link between cyclical comet showers and mass extinctions, including the one that they believe wiped out the dinosaurs 66 million years ago. NYU's Michael Rampino and Carnegie's Ken Caldeira traced 260 million years of mass extinctions and found a familiar pattern: Every 26 million years, there were huge impacts and major die-offs. More