Science: Flyless Mountain

Many scientists, especially those who study living wild creatures, are leary of DDT. It does too good a job, upsets the balance of nature. By killing innocuous insects, it starves insectivorous birds. By killing bees and other pollinators, it keeps plants from producing seeds. If it gets into water, it may kill fish.

Last year, a group of nature-loving scientists at New York's American Museum of Natural History decided to find out how DDT could be used against harmful insects without hurting innocent wildlife. As a test area they chose five square miles of Bear Mountain Park, a popular resort infested with...

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