@galena
To make a nuke, you need a good amount of high grade nuclear material, and some material that is good at reflects neutrons back towards the nuclear material. Last I checked beryllium did the trick just nicely. So get your uranium or plutonium, put it in a beryllium box, and boom.
P.S. to the feds following him, he now knows how to make a nuclear weapon. Get him!
@galena
Imagine being such a pleb that you play vanilla minecraft, instead of the godly mods that let you mine uranium.