The North Korean leader’s recent disappearance for three weeks led to intense speculation about his health. What would happen if Mr Kim's regime collapsed? Peter Singer, an author and political scientist, explains how his novel, set in the near future, is helping policymakers respond to artificial intelligence. And how feasible is wireless charging for electric cars? Tom Standage hosts

Music by Chris Zabriskie "Candlepower" (CC by 4.0)

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