Making human flesh unappetizing to mosquitoes, ticks, flies, and fleas is an age-old preoccupation. The earliest insect repellents included smoke, mud, and various plant substances. Our contemporary contribution is DEET (N, N-diethyl-meta-toluamide), a powerful insecticide found in over 400 repellents. DEET can peel paint, damage rayon and spandex, and melt plastic. Up to 56 percent […]

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