 And so it's working, that's what it goes very, very hard and it works very fast and very strong beats. And that's why the people that have compromised cardiac performance, they're the ones that are likely to suffer early. And of course, just in heat waves, even if people aren't actually working, it's one of the reasons why you find the elderly who are the first to succumb. But of course, that can happen to anyone who's pushing themselves too hard.