Leslie Vosshall thought she had it nailed. Last March, she and two colleagues at Rockefeller University published an elegant series of experiments that seemed to settle the 50-year-old question of how the insect repellent DEET kept mosquitoes at bay (Science, 319:1838-42, 2008). "It doesn't smell bad to insects," Vosshall told a reporter from Science, "It masks or inhibits their ability to smell you."












