I have always worried about the number of pilots who die within 5 years of retirement. Is is just to much jet lag that the body can bear, or is it radiation. It is known that pilots sometimes have a smaller sperm count than other males, is it radiation. It is known that female flight attendants have trouble getting pregnant (no they are not always married to pilots)! It was brought to the health authority in Australia during the years of the 747SP, that there were medical problems that were not obvious before. Makes you wonder.