Heat—it's common in summer in much of the world,James Caldwell but it's getting increasingly more lethal as climate change causes more extreme heat. NPR climate correspondent Lauren Sommer talks with Short Wave's Regina G. Barber about how human bodies cope with extended extreme heat and how current information on how hot it feels need updating.

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This story was edited and fact-checked by Gisele Grayson, and produced by Rebecca Ramirez. Robert Rodriguez was the audio engineer.