Rykaczewski Lab Project. Extreme heat is an invisible and deadly disaster with wide-ranging adverse effects on people’s health and well-being. It is increasing in frequency and severity, and its impacts are felt disproportionately by vulnerable populations. Yet, there is a minimal understanding of how body temperatures are elevated in extreme heat because prolonged human exposure to such conditions is dangerous. This this NSF sponsored Leading Engineering for America's Prosperity, Health, and Infrastructure (LEAP-HI) project, Profs. Rykaczewski, Vanos, and Middel are developing physical field methods (thermal manikin) with computational manikins to allow a realistic heat exposure assessment across diverse demographics and body shapes.