The article mentions that research shows "humans can't survive more than 6 hours in 95F/35c with 100% humidity". This is hard to believe, as I lived in a place

The article mentions that research shows "humans can't survive more than 6 hours in 95F/35c with 100% humidity". This is hard to believe, as I lived in a place that had common summer highs of 100 for much of a day and humidity in the high 90%'s, also known as the american south. People survived there just fine for thousands of years before Europeans got here, and even us wimpy americans survived a couple of hundred years before modern AC. Looking at the linked article, it talks about wet-bulb ie 100% humidity being different somehow as you can't shed excess heat. In other hot parts of the world with frequent rain and humidity people do survive - perhaps the authors are getting at something else. I don't want to live in that world though.