Minute by minute, what happens to the body during heat stroke

As temperatures soar across the US, experts are warning of the dangers of deadly heat stroke — which can start to develop after just 10 minutes of sitting outdoors in many parts of the country.

This week, meterologists sounded the alarm as swathes of the Northeast, Midwest, and even parts of are set to face a and heat indexes over 100 degrees Fahrenheit.

Already the leading weather-related killer in the US, the heat is leading officials to warn the millions in the heatwave's area to take the next few days' climate 'seriously,' or risk becoming one of the 700 Americans who die from it each year.

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