Do you live near a crematorium? You might want to move. A very tiny amount of mercury vapor in the air in your neighborhood can cause permanent damage to your nervous system. As it turns out, when you burn dead people, the nearly inert mercury mixed into the fillings in their teeth vaporizes into toxic vapor. One scientist in England figured that a busy crematorium can put as much as 24 pounds (11 kg) of mercury into the air every year.