THE IAEA (International Atomic Energy Agency) reports that Iran just might know how to make an atomic bomb. They apparently learned how to do it from a bomb maker in Pakistan. The only surprise is that they didn't just get it off the web like everybody else. Unfortunately it isn't rocket science. How do they (try to) prevent the spread of nuclear weapons technology? They regulate three things. 1. Uranium and 2. Really fast centrifuges, and 3. Collimators.

Here's a centrifuge. Here's what you do with it:

Next we look for an ignition source. From the diagram:

It looks like we need neutrons. In fact what we need is a neutron gun. Here's one -

Attached to the neutron gun is the collimator. Think of it as a focusing lens for neutrons. It looks like this:

Your finished bomb: