As my colleague Tara Parker-Pope has noted, there is no known biological mechanism for the phones’ non-ionizing radiation to cause cancer, and epidemiological studies have failed to find consistent links between cancer and cellphones.

It’s always possible today’s worried doctors will be vindicated, but I’d bet they’ll be remembered more like the promoters of the old cancer-from-power-lines menace  or like James Thurber’s grandmother, who covered up her wall outlets to stop electricity from leaking.

Driving while talking on a phone is a definite risk, but you’re better off worrying about other cars rather than cancer.

5. Evil plastic bags. Take it from the Environmental Protection Agency : paper bags are not better for the environment than plastic bags. If anything, the evidence from life-cycle analyses favors plastic bags. They require much less energy  and greenhouse emissions  to manufacture, ship and recycle. They generate less air and water pollution. And they take up much less space in landfills.

6. Toxic plastic bottles. For years panels of experts repeatedly approved the use of bisphenol-a, or BPA, which is used in polycarbonate bottles and many other plastic products. Yes, it could be harmful if given in huge doses to rodents, but so can the natural chemicals in countless foods we eat every day. Dose makes the poison.

But this year, after a campaign by a few researchers and activists, one federal panel expressed some concern about BPA in baby bottles. Panic ensued. Even though there was zero evidence of harm to humans, Wal-Mart pulled BPA-containing products from its shelves, and politicians began talking about BPA bans. Some experts fear product recalls that could make this the most expensive health scare in history.

Nalgene has already announced that it will take BPA out of its wonderfully sturdy water bottles. Given the publicity, the company probably had no choice. But my old blue-capped Nalgene bottle, the one with BPA that survived glaciers, jungles and deserts, is still sitting right next to me, filled with drinking water. If they ever try recalling it, they’ll have to pry it from my cold dead fingers.