Science: Cooling for Posterity

Dinosaurs may have died out because they could not control the temperature of their reproductive organs. So says Dr. Raymond B. Cowles, of the University of California. Dr. Cowles is a leading authority on animal airconditioning. This week, writing in Science magazine, he turned his probing mind to bats and their special heat-regulating problems.

Dr. Cowles believes (with most zoologists) that warm blood is a key factor in evolution. Like diesels and steam engines, animal mechanisms are more efficient at high temperatures. This is one of the chief reasons why mammals and...

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