FORGET ABOUT WHETHER AN ERRANT COMET, ANGRY volcano or invidious virus killed the dinosaurs 65 million years ago. Scientists have still not explained how the Saurian dynasty got started or why it dominated the earth for more than 150 million years. The discovery in northwestern Argentina of the fossilized skeleton of a 10-kg (22-lb.) carnivore that is 230 million years old may help paleontologists begin to solve the mystery. In the British journal Nature, researchers from the University of Chicago and the National University of San Juan, Argentina, report that the dog-size predator is the most primitive dinosaur ever found.
Although...
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