"hypo" means low, so it's low gonad-- hypgonadism. >> i discovered it nine years ago. felt the aging process. i was 65 at the time. >> narrator: donald bollhorst is a part-time travel consultant in the baltimore area. he also owns and operates his own airport shuttle service. donald's discovery of low testosterone came with aging. he is now 74. >> and all of a sudden, i felt like i was getting low energy, and, you know, my sleep habits were not good. muscle aches. i felt like my age was processing. >> now, for men, men lose testosterone. as soon as they turn 40, they lose, perhaps, at a rate of 1% to 2% a year. >> mcfarland: testosterone levels are measured numerically in a reference range of nanograms per deciliter. >> there's a threshold of testosterone levels, and what i mean by that is the normal range from 300 to 1,000. >> mcfarland: for men, a drop in testosterone below the 300 mark can lead to some very noticeable symptoms. >> some of the problems in an adult male would be loss of interest in sex, loss of libido. so he's unable to have sexual activity. and somet

man's got plutonium in his testicles--and every male in the northern hemisphere has a tiny load in his gonad--it's from weapons testing days, and plutonium is still falling out. and the man is cremated, the smoke goes up the chimney with the plutonium, so you can breathe it in, another man can, and it's ad infinitum because plutonium has a half-life of 24,400 years and lasts for a long time. but the other thing is that the body thinks plutonium is iron--it's an iron analogue--so it's stored in the liver, where it causes liver cancer. it's stored in the bone marrow to cause--to produce hemoglobin in the red blood cells, but it causes leukemia or bone cancer. it crosses the placenta into the developing embryo--which lets nothing through it, incidentally, except plutonium and a few other nasties. it's stored in the testicle, too. so it's a ubiquitous, really dangerous isotope, and from the time they discovered it in the manhattan project, they knew its dangers. >> does plutonium come only from nuclear weapons testing, or is there a risk of it escaping from nuclear power plants as well? >> it's