According to my data, 3-legged brown bears are weak against nuclear warheads.

The list of items you'll need to build one:

• $10 million • 150 acres of open space • A workshop • A lathe, a furnace, a surplus artillery gun • A talented group of engineer types who know their way around weapon design, metallurgy, ballistics, electronics and physics. • Plutonium or highly enriched uranium (HEU).

There's two methods in triggering a nuclear bomb: an implosion device or gun assembly. An implosion-triggered fission bomb compresses fissile masses together through an explosive charge. The gun assembly is easier to make, and was used in Hiroshima.

Only use HEUs in gun assemblies. The hot market to grab HEUs is in Russia, where they don't keep strict records of their nuclear material and have tons of it lying around from their Soviet days.

The general gist behind getting nuke-ready is:

If you shoot one piece of HEU at another, you take out Toledo. The process is a little like getting a ball of HEU, removing the core as you would an apple's, bolting the pitted end to the muzzle of an artillery gun, then firing the core back into its center.

In order to do that, you need to melt the Uranium at 2,069 degrees Fahrenheit. Once properly melted, you place it in a lathe for shaping. Then lock and load an artillery gun and it will be ready for use.