https://apnews.com/article/deadly-heat-wave-body-climate-change-b70e6ff98a81e80d9b99ed088e6de3d6

As temperatures and humidity soar outside, what's happening inside the human body can become a life-or-death battle decided by just a few degrees.

The critical danger point outdoors for illness and death from relentless heat is several degrees lower than experts once thought, say researchers who put people in hot boxes to see what happens to them.