Horeshoes, Hand Grenades, and Small Nuclear Weapons

Close enough for government work, I guess:

Britain's biggest nuclear site can't account for 30 kilograms of plutonium – enough to make seven or eight nuclear bombs.

But officials with the U.K. Atomic Energy Authority said Thursday that it's a measurement problem and the plutonium is not really missing.

Of course, the only way you could know for sure is to measure it in some more robust fashion, but why bother? Not like there's a bunch of Muslim fanatics trying to get their hands on nuclear material or anything.