 Heat can be radically misunderstood in terms of what it means to people, let alone everything in the world around us. In medical school, when I was taught about heat, it was about so-called heat-related illness, which is not sort of anything bad that can happen to health when it gets hot out. It really refers to very specific clinical problems like heat stroke. The evidence is clear, though, that when it comes to health, heat can be bad for a lot of things,