With many kilos of fissionable material, high grade Uranium and Plutonium lost just in the USA, discounted as an "accounting error", it is well to ponder how easy it was for a couple of college students to design a workable atom bomb from scratch. This was back in the '60s that the kids did it, and it took less than three years for them. I'm astounded that it's a problem for many nations on Earth to pull off the same feat. Or, have they?
Hey, kids, let's build an atom bomb!