Michio - you must be joking. You are worried about the two LEAST important and statistically negligible issues of our time. Firstly the dreaded global warming nonsense. We have had no warming for over 15 years regardless of the hype and nonsense coming NASA - so basically you fear some something that really doesn't exist. There is also not one shred of valid scientific evidence to support the hypothesis of Anthropogenic Global Warming (AGW) - in fact there is just as much valid scientific evidence for AGW as there is for your string hypothesis - NONE. Terrorism??? Some people fear air travel even though statistically it is more dangerous to cross a busy street. You fear terrorism??? - the statistics for being either being killed or injured resulting from a terrorist ack is so insignificantly small (around 0.00000000000001% chance) it is not even worth thinking about. The statistics for being a victim of alien abduction are probably greater You truly are a believer in the non existent and unbelievable - Michio I think you need to wake up and join the reality in which we all live.