More pseudoscience behind the "radon" claims. There are places in the world that run a business around radon spas (as in, you rent time in a natural radon cave). As for not hearing about the systems, radon will only ever be found in homes with basements which are pretty much only found in northern "flyover" states. Certainly NOT along the coasts where the vast majority of the population lives. I don't personally care about radon (grew up with it, closing in on 6 decades and don't have any health issues from my 18 years of spending most waking hours in the basement of a house that tested fairly high with radon in 2009 when my folks sold), but put it in to prevent the Karen buyers from having their hissy fit over it.