Every time a nuke is launched, the world tenses up.

Thanks to North Korea’s successful test-launched of an intercontinental ballistic missile, we’re back in that place again.

Since the Cold War we’ve been told the right nuclear weapon could destroy the whole world, but how much truth is in that?

Chris Ilsley spoke to  Non-Proliferation Policy Arms Control Association director, Kelsey Davenport who explained the power of nuclear weaponry.

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