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A NOAA analysis shows a steady increase in the average number of heat waves per year, with about two in the 1960s and six per year in the 2010s.

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Summer sports camps and pre-season training often have kids running hard in high heat and humidity. The combination can be deadly.

Research on young, healthy humans found the body begins overheating when exposed to temperatures and humidity lower than previously believed.

In many regions of the world, the pace at which fire weather conditions are increasing is accelerating faster than climate models predicted.