What is so difficult about developing nuclear weapons that makes some countries incapable of making them?

Question

What is so difficult about developing nuclear weapons that makes some countries incapable of making them?

In: 1394

Answer 1

The most difficult part is sourcing the materials, from the gases/chems used in purification/centrifuge, to the very specific strategic minerals or precision-made tools (like tubings, etc.) needed.

Anti-proliferation laws, especially on “dual use” stuff keeps a lot of stuff out of “bad hands”. It’s laws, not science or technology so much, as that’s all too easy to get, as looking into Dr.Abdul Qadeer Khan will show.