In the relentless, never-ceasing war of man v. insect, each side has just won a minor skirmish:
In Orlando, Fla., after two years of experimenting and selective breeding, the Department of Agriculture's Bureau of Entomology and Plant Quarantine produced a sturdy strain of houseflies that could survive doses of DDT big enough to scare a beetle. Flies of the 35th generation were as robust as ever after absorbing twice the amount of DDT it takes to kill a normal fly. A fit few were still buzzing after a triple dose. While the bureau saw no danger of a race of superflies, there...
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