 And so it's important that if you try that, experiment with it, because your instinct might say, I'm just going to be cranky and that's it, as opposed to trying to bond together and have empathy for other people's crankiness. If they're cranky, don't snap back at them. Just say, oh, God, I know how easy it is to lose your cool in this heat. These neurochemicals you mentioned, they come from the brain? Yes, they come from the brain and the enteric nervous system, the GI tract.