It’s 80 years since the United States dropped atomic bombs on Japan. At the time, the US was the only country with nuclear capability, but now nine countries have nuclear weapons

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Here we explore how those countries developed their arsenals and why others are being stopped.

00:00 First nuclear detonation
00:39 Which countries have nuclear weapons?
01:15 Types of nuclear bombs: fission and fusion
01:55 Eisenhower’s Atoms for Peace plan
02:45 Who are the original five nuclear states?
03:06 What is the Non-Proliferation Treaty, NPT?
04:22 Which countries have not signed the NPT?
04:52 Israel’s nuclear weapons
07:29 India and Pakistan’s nuclear weapons
09:32 North Korea’s nuclear weapons
11:03 Iran’s nuclear programme
13:10 The legacy of the Non-Proliferation Treaty

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