Readings of a key indicator of heat exposure danger have reached the highest possible threat level in multiple southern states, as well as in a few states in the Midwest.
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How hot is too hot for the human body? (Opinion) houstonchronicle.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from houstonchronicle.com Daily Mail and Mail on Sunday newspapers.
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