Research now shows that mosquitoes may bite the hand that feeds them Deet — at least in time. The commonly used chemical — which is the gold standard ingredient approved by the Environmental Protection Agency (EPA) to act as a mosquito repellent — has recently been shown to potentially attract the pesky insects, as they’ve come to associate the chemical with a fleshy meal. Professor Claudio Lazzari of the University of Tours in France told The Guardian that scientists previously believed that