Mosquitoes are known for tracking down their favorite “human snacks” through CO2 exhalation, body heat, and smell. But some of us often complain about getting more than enough bites. There are countless theories about why mosquitoes prefer some people over others – blood type, blood sugar, being female or child, all without enough credible data. According to the study published in the article, “Differential attraction of mosquitoes to humans is associated with skin-derived carboxylic acid levels.” They recently showed that fatty acids released from the skin can create an intoxicating odor that mosquitoes cannot resist. They published their results in ‘Cell’. In the three-year study, eight participants were asked to wear nylon stockings over their forearms for six hours a day. They repeated this process over several days. Over the next several years, the researchers tested the nylons against each other in all possible combinations through a round-robin style “tournament.” They used a two-choice olfactometer test that De Obaldia built, consisting of a Plexiglas chamber divided into two tubes, each terminating in a box containing a stocking. They placed Aedes Aegypti mosquitoes — the main vector species for Zika, dengue, yellow fever and chikungunya — in the main chamber and observed how the bugs flew through the tubes to one nylon or the other.