Science: What Killed the Dinosaurs?

One hundred million years ago the monstrous dinosaur was the king of beasts. Then the dinosaurs suddenly died off, leaving dominance of the earth to smaller, warm-blooded mammals. One theory is that the great die-off was caused by a sudden change of climate. Another is that the slow-witted, blundering dinosaurs could not cope with mammals that destroyed their eggs. Biochemist Albert Schatz of National Agricultural College, Doylestown, Pa. has a third theory: that the evolution of modern plants was the death of the dinosaurs.

According to Dr. Schatz, the dinosaurs were sluggish beasts whose...

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