What Really Killed the Dinosaurs?

Sixty-five million years ago, an asteroid killed the dinosaurs. Not that the ruling reptiles made it easy—Tyrannosaurus, Triceratops, and company didn’t stand in one place, stoically waiting for the inevitable. Rather, the six-mile-wide chunk of extraterrestrial rock struck the Earth with such force that it sparked a global firestorm followed by a thick dust shroud that slowly choked whatever...