there are satellites in polar orbit, we are not allowed to see any data from those. no man is allowed to set foot on antarctica, even though it isn't claimed as either a sovreign nation or the province of another already established nation. i think that aliens are a perfect cover up for the fact that the top nazi brass fled to base 211 in the antarctic following their exodus from europe and that we prevented the effect but missed the cause in number two. byrd met them in forty seven, and found them to be a force far beyond anything he'd ever seen. the poles have been sealed since.
live earth...what a joke! all that electricity generated from coal, all the transportation there creating CO emissions, all the food waste not to mention the methane created by so much flatulence. wanna be green? play an acoustic in the park. give me a break!
as stated, unenriched uranium is fairly harmless, plus uranium is a good shield for neutrons. it emits fast neutrons which pass thru the body quickly, the slow neutrons are shielded by the uranium. for a criticality to occur you need three things....mass, moderator and geometry.