When heat turns deadly

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A world-first study challenges our understanding of how humans cope with extreme heat. Owen Dillon’s heart is pounding. Sweat is dripping down his neck, and he’s feeling tired and weak. Inside the climate chamber where he’s sitting, it’s unbearably hot.

It’s been set to 54 degrees Celsius, with 26 per cent humidity — a combination believed to be lethal after six hours. After just a short period of time, he understands why.