Penn State researchers found that the maximum wet-bulb temperature humans can endure is lower than previously thought — about 31°C wet-bulb or 87°F at 100% humidity — even for young, healthy subjects. The temperature for older populations, who are more vulnerable to heat, is likely even lower.
What a lot of countries with really hot weather do is stop work for the hottest part of the day
Siesta is what you do when you don't want to die of heat stroke.
only mad dogs and englishmen go out in the midday sun