Excessive heat across the United States is making this summer a season of sweat. Perspiration and its evaporation are crucial to keeping us cool when things get hot. But our understanding of how sweat evaporates is limited to the profuse phases of the process, when our bodies are coated in a sticky film or even pools of perspiration. Relatively little is known about the dynamics behind initial phases of sweating, when tiny droplets are emitted by individual sweat glands and then quickly evaporate.
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