At backyard gatherings across South Florida, some people are swarmed by mosquitoes while neighbors stand untouched — a disparity that science is now explaining not as chance, but as biology. Researchers studying three regional mosquito species have found that these insects employ a sophisticated sensory system to identify preferred human hosts, guided by chemical signals, heat, and physiological markers unique to each person. The findings reframe what many have long dismissed as bad luck into a legible biological phenomenon, one with meaningful consequences for disease prevention and personal