Yeah, probably the most difficult part of the entire process of making a bomb is enrichment. The uranium in uranium ore is 99.3% (useless) U-238 and only 0.7% (

Yeah, probably the most difficult part of the entire process of making a bomb is enrichment. The uranium in uranium ore is 99.3% (useless) U-238 and only 0.7% (useful) U-235. These are chemically identical, so the only thing you have to go on is the slight difference in weight, thus the _extremely_ difficult methods like centrifuges. (You need to build a giant "cascade" of them refining at different levels.) I'd say it's basically impossible that he figured out a way to refine uranium for $2000.