Some people are scared that cell phones cause brain tumors. There are enough of these bedwetters that San Francisco just passed a new law to “require all retailers to display the amount of radiation each phone emits.”
For most phones, that’s roughly one watt; the legal limit in the U.S. is 1.6 watts.
Studies have yet to find a link between cell phones and brain cancer. The main reason is that it is physically impossible; one watt of radiation just isn’t enough to cause any tissue damage.
The human body naturally generates about 100 times as much energy at rest, and 1000 times as much during exercise. One measly watt isn’t enough to affect anything.
One wonders why the bed-wetters are only worried about brain cancer; cell phones are held in the hand. And unlike the brain, which is shielded by hair, scalp, and skull, the hand is completely unprotected from cell phone radiation. If cell phones did cause cancer, activists should be at least as worried about skin and bone cancers in the hand.
But they aren’t. One reason is that those cancers don’t sound as scary as brain tumors do; it’s harder to get people worked up and frightened.
The other reason is that cell phones don’t cause cancer. Not in the hand. Not in the brain. Not in the face, the, jaw, or any other body part might take the brunt of the single watt of energy our cell phones emit.
Inertia Wins! 
