This episode, we decided to delve into some of the more serious, thoughtful, and future-thinking topics Popular Mechanics covers. In keeping with the theme, we interview iceman Wim Hof about how he changes his own autonomic nervous system so he can hang out in freezing temperatures for hours. (If you want to learn even more than what Wim explains in the segment, check out www.wimhofmethod.com.) Not in keeping with the theme, we also test out a soda called kvass, which is sort of like Russian kombucha.