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How much do you know about nuclear weapons? Take our quiz.

The nuclear arms race that began during World War II continues today. How much do you know about its science, history, and politics?

3. Which material is NOT needed to build a nuclear weapon?

(Read caption)

A gas mixture of the hydrogen isotopes tritium and deuterium


Chemical explosives


A mass of fissile material – usually, enriched uranium or plutonium

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