My thought for today is the misunderstanding and misuse of the concept of radioactive "half-life." I just heard someone this morning on NPR describe Cesium-137 as "harmless" in 30 years. No, 30 years is when it has lost half of its radioactivity, leaving it still danger to living things (including us) for at least another 270 years. The rule of thumb is to multiply the half-life by a factor of ten. NIRS above is even more conservative, suggesting 10 to 20.

Have a nice "half-life"!

Charley Noble