Nukes of hazard: US-Russia arms treaty expires

The New START nuclear deal was signed in 2010 to restrict the number of strategic warheads and missiles America and Russia could amass. Will there be a new deal – and what will happen if not? How social media has helped fuel recruitment to cults. And our baldness correspondent bristles at some hairy questions.

Listen back to "The Bomb", our Babbage series on America's quest to modernise its nuclear arsenal.  

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