Listen to the documentary Fyra minuter från kärnvapenkrig in Swedish. Some translated excerpts from the introduction on the web page of Swedish Radio:

25 times we have been close to nuclear war. Each time due to misunderstandings or technical breakdowns. How long can the luck last?

One chance in three

So large is the risk of dying in a nuclear war, the physics professor Max Tegmark assesses.

Read more in English why Tegmark has called on the research community to support a ban on nuclear weapons and about countries like Russia refusing to join.