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What's In a Nuclear Weapon?

Negotiations over Iran's nuclear program aim to build on an April agreement targeting the infrastructure needed to produce plutonium and enriched uranium, key components of nuclear weapons. To understand what those elements are and why they matter, start with a look inside an atomic bomb. Stray bits of atom -- called neutrons -- collide with uranium or plutonium in the bomb's core, splitting the atoms apart and releasing enormous amounts of energy. But not just any uranium will...

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