Since my teenagers both became cell phone enabled a few years back, I’ve been nagging them about the four steps they need to take to keep safe. I’ve worried about brain tumor ever risk since the World Health Organization determined that cell phone radiation is a “possible human carcinogen” and studies showed that children receive double the cell phone radiation as adults because of their thinner skulls. But what about the electromagnetic fields—better known as EMF—generated by wireless technologies such as cell phones, tablets and WiFi? Recent action taken by the French government has me worried about that, too.