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Nuclear Fuel How-To
ATMosby writes "The BBC has an article that pretty much sums up everything you might need to know if you wanted to refine nuclear fuel and build some atomic weapons." From the article: "Uranium is the basic raw material of both civilian and military nuclear programmes. It is extracted from either open-cast pits or by underground mining. Although uranium occurs naturally all over the world, only a small fraction is found in concentrated ores. When certain atoms of uranium are split in a chain reaction, energy is released. This process is called nuclear fission."
Sorry, but that site isn't even close to "everything you might need to know" about building a Bomb. That's more like the 5 minute capsule summary. If you really want to know everything about building a Bomb but don't want to get a security clearance, the best place to look is Carey Sublette's Nuclear Weapon Archive. It's amazing just how much non-classified information it contains.
There's no point in questioning authority if you aren't going to listen to the answers.
The tough thing about implosion bombs is getting a uniform shockwave. This requires high purity explosives that behave exactly the way you want, every time, high-predictability capacitors, and very time-precise triggering mechanisms. Parts that can be used in the triggering mechanisms (such as krytrons) are harder to come by.
Such capacitors and explosives are within the reach of a state like Iran (and Iraq claimed to have produced them before the first Gulf War), Krytrons, however, use beta from Ni-63 to help keep the gas in them ionized (to allow for a faster arc discharge), so they take more effort.
All we want to do is eat your brains.