I'm posting this simply because I thought it was amazing. A few weeks back the wall street journal ran an article about safety testing on depleted uranium (DU) balistics.
DU is dense, heavy, and according to the article has "60% of the radioactivity" of naturally occuring uranium ore. Because of these properties the military uses it to harden anti-tank rounds. Plus some M1's are outfitted with a DU "flack jacket" of sorts that coats the external metal of the tank.
Here was the part that blew me away. The pentagon sited a case during desert storm where an M1 was taken on by 3 Iraqi tanks (some how the M1 got seperated from its squad). The Iraqi tanks shot at the M1 but the shots bounced off because Iraq does not have hardened rounds. The M1 then proceeded to quickly destory 2 of the Iraqi tanks w/ depleted rounds. Here is the real kicker; the final Iraqi tank hid behind a sand dune, but was still destroyed because the M1 captain fired though the dune with a DU round.
I found the last statement particularly amazing.