1. Russia
2. China
3. US government
4. someone else
5. hypochondriacs
6. some environmental factor
Take your pick
My leading guess is that it was something the US government was doing to others in some form, and has now been adopted/adapted by Russia/China against the US. I obviously have no evidence for this, but the reason I say this is that I think its unlikely that we haven't figured out whats causing it after all this time, and this would be one reason why the causes remain a mystery (in public at least).
Poll
