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Since the earliest days of mobile phones, a small but steady contingent of environmental activists, conspiracy-inclined folks, and some scientists have warned about the hidden damage they could be causing to our bodies, due to the radio frequency energy cellphones use to communicate with cell towers. They fear that this non-ionizing radiation could penetrate our cells and cause damage, increasing our risk of brain and head cancer. But scientists elsewhere have dismissed this potential link as, at best, unproven and, at worst, utterly implausible. In a surprising move this week, however, the California Department of Public Health (CDPH) weighed in on the debate, warning people, especially kids, to stay away from cellphones whenever possible. The agency also issued guidelines on how to reduce exposure to radio frequency energy.