Cell phone jammer:
With this cell phone jammer switched on in your pocket you will be able to silence those anti-social types who insist on using their mobile phones in the most indiscrete way, the beauty is that they will not know it is you that has switched them off!, all they will see is that their signal has dropped on their phone.
I couldn’t find instructions on how to build your own cell phone jammer, but I found complicated (for me) GPS jamming instructions (not that I condone it).
Tumor may be linked to cell phone use:
A Swedish study suggests that people who use a cell phone for at least 10 years might increase their risk of developing a rare benign tumor along a nerve on the side of the head where they hold the phone.
Something else to add to the growing list of cancer causing sources: food (via pesticides, hormones, pharmaceuticals), electrical machines (microwaves, televisions, computer monitors, etc.), air, sugar, plant sap…