Are you wondering how those pesky mosquitoes find hosts to victimize? Results of flight tunnel studies on the mosquito Aedes aegypti, the vector of dengue fever virus, revealed that carbon dioxide detected as turbulent plume leads to more directed flight upwind by the pest. A plume of this gas that is fluctuating in concentration and mimicking the presence of a live host elicited the best response. Carbon dioxide alone, without host odor, is enough to induce directed flight toward the source. This first encounter with the gas is…