Asbestos was a popular material for most of the twentieth century, mainly because of its ability to insulate and act as a fire retardant. In fact, it’s still used heavily in some parts of the world, such as India and China. We know enough about the risks now, though, that it’s banned outright in more than 50 countries according to asbestos.com and banned for some uses in the US. But how worried should you be if you find it in your home?