Saw this on XKCD a bit ago. Useful chart of exactly what various levels of radiation are like, and how much of a hazard they are.
I’m pleased he listed the amount of radiation caused by cellphones (none whatsoever), as well as that caused by bananas (0.1uSv). The next time someone rants about cellphone radiation, I will calmly explain to them that *bananas* produce more radiation.
I may leave off the fact that you’d have to eat a billion bananas* to have any risk whatsoever, or that their own bones are producing four thousand times as much radiation…
* TEN billion for immediate hazard (1Sv), but if you’re eating that many bananas, you have bigger problems to worry about.