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As heat records fall, how hot is too hot for the human body?

  • Written by W. Larry Kenney, Professor of Physiology, Kinesiology and Human Performance, Penn State
As heat records fall, how hot is too hot for the human body?Outdoor workers face higher risks on hot, humid days.AP Photo/Swoan Parker

Extreme heat has been breaking records across Europe, Asia and North America, with millions of people sweltering in heat and humidity well above “normal” for days on end.

Death Valley hit a temperature of 128 degrees Fahrenheit (53.3 degrees Celsius) on July 16,...

Read more: As heat records fall, how hot is too hot for the human body?

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