 And so what he's advising us to do, because many people still in the world don't have air conditioning, is to make sure that we understand if you're feeling dizzy, if you're feeling nauseous, if you're feeling overcome, very headachy, you could be having a heat-related reaction to heat in your body, in which case you need to get out of the sun, take your clothes off, get in a cool place, cool yourself down as soon as possible. There are two different kinds of heat strokes. One is worse than another.