 And they're floating through the air. And they're going to meet your nose. And the air conditioning, for those people who are not that good with it, don't adapt as well. But air conditioning also, besides that, even though it's a necessary thing and it has revolutionized our lives, no question about it, in our living quarters, in times when there's heat, still can cause problems, including muscle pain and stiffness, prolonged exposure to cold temperatures.