If you are politically active and go to a lot of public demonstrations, don't
bring cellphones, videocams,
mp3 players, etc., as a new police crowd control devices shoots a plasma cloud
at the crowd to be subdued. It will probably "fry" them, but tube radios should
easily survive. It can even stop cars.
Read this:

http://www.newscientist.com/

the look for story on "Sweeping stun guns...."