The race against radon
Chris Baraniuk writes: Deep in the frozen ground of the north, a radioactive hazard has lain trapped for millennia. But UK scientist Paul Glover realized some years back that it wouldn’t always be that way: One day it might get out. Glover had attended a conference where a speaker described the low permeability of permafrost — ground that remains frozen for at least two years or, in some cases, thousands. It is an icy shield, a thick blanket that locks…