Who survived the sinking of the Titanic?
Prime numbers As of 29 January Boris Johnson will have been Prime Minister for two years and 190 days. Currently he is 38th out of 55th in the list of longest-serving PMs, sandwiched between Henry Campbell-Bannerman, whom he overtook on 22 November, and Spencer Perceval, the only PM to have been assassinated. Johnson will have to survive in office until 1 March to overtake Perceval. If he is still in Downing Street on 6 June, he will have overtaken Gordon Brown. He would overtake Theresa May on 5 August and Jim Callaghan on 23 August. Men overboard A new exhibition challenges the idea that women and children aboard the Titanic