Science: The Too-Warm Dinosaur

If heat can sterilize a bottle and a surgical instrument, why can't heat sterilize a man? A scientist who thought up this murky question, and has been brooding over it, is Biologist Raymond B. Cowles of the University of California at Los Angeles.

Dr. Cowles began by asking himself: why did the dinosaur become extinct? Dismissing the usual theories (the dinosaur's unwieldy size, an increase in the earth's carbon dioxide, etc.) Dr. Cowles decided that it was much more likely that dinosaurs simply perished of a declining birth rate—just stopped breeding during an interglacial heat wave. Last week he was ready to...