So radioactivity from the Japan nuclear mess is raining down on us from. Oh yeah, that's just in addition to the "natural" radiation we are being exposed to all the time, right? And it's not dangerous. Well, I'm not so sure.

There are different kinds of radiation. For example there are alpha, beta, and gamma rays. Each of those kinds of radiation has their own characteristics. For example, some penetrate matter and others don't. And the elements don't throw off exactly the same kind of particles and they throw them off at widely varying rates. They also have widely varying "half-lives" which is the time it takes for them to throw off enough particles to be to half of it's previous state.

Once a radiation particle gets in you, it stays as long as it is in existence, throwing off particles. A radiation particle can get in you through the air you breathe, the food you eat, or even through a cut or wound. Once it is in you, even if itsn't a particle that can penetrate a body from the outside, it can still damage parts of cells.

And the "risk" (I hate using that word, it's such a system word) is cumulative. Once you have been exposed to radiation, it doesn't just disappear. So while the governments say, "there's no immediate danger," that may be true, but there is danger down the road, and they aren't talking about that.

And Obama's escapade into Libya has bogged down. They are having to defend against charges that they have killed civilians, and it hasn't slowed down Khaddafi's army in the long run. What's Obama going to do now?