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 not emitted by power plants routinely. routinely, power plants emit radioactive elements all the time. tritium-- they cannot prevent tritium escaping--highly carcinogenic. it's--hydrogen--radioactive hydrogen, h3, highly carcinogenic. that's probably what's causing the cancer in the kids living around the reactors in germany. carbon-14, highly carcinogenic. xenon, krypton, argon are all emitted, and they say, "oh, it's just routine," like i could say, "oh, you've just got a routine cancer, don't worry about it." that sort of thing. plutonium doesn't escape until there is an accident like a meltdown or an explosion like fukushima or chernobyl. three mile

a beacon reminding us of the risks and placenta in shedding light. something horrible happens and everybody is running away from it. trellis or running to it. planning some sort of trivial memorial service for jim foley. the death of a has impacted the entire northwestern community. live this afternoon. the attorney general has arrived in st. louis on his way to ferguson. a grand jury will begin hearing evidence in the shooting death of michael brown. the plane touched down in st. louis about one hour ago. a turning point was reached last night. protest remained mostly peaceful with no cocktails thrown or tear gas fired. 47 arrests were made after rocks and bottles of urine or thrown at police. other demonstrators have been aimed at the chief prosecutor. some feel cannot be objected because of his ties to the police department. >> voluntarily recuse yourself from this investigation. the people and african-american community to not have the confidence matt you will be fair and impartial. >> can i guarantee any particular outcome on the investigation.