Indeed, we now have some understanding of how nuclear fission - that is, splitting of atoms - works. Still we have no idea why the Star Gods are so iffed at this technology. Maybe it's because it doesn't use their Hellerium, but something much less... nice. For now, we have figured out how to make this and that, but the topic is challenging. We need a Power Station and a Refinery present at a Hideout to effect any atom-related manufacturing.