The former vice-president was the big winner in the races to choose a Democrat candidate. Only Bernie Sanders now stands in his way. Also in this programme: the US and the Taliban sign an agreement preparing the way for peace; a ceasefire is declared in Idlib after Turkey attacks Syrian government targets; the clash in Britain between a government minister accused of bullying and her top official; and what Renaissance Italy can teach us about fighting coronavirus.(Picture: Joe Biden at a Super Tuesday campaign event in Los Angeles.Credit: Getty Images)