The Bank of England unveiled the design of a new banknote celebrating mathematician Alan Turing, who helped Britain win World War Two with his code-breaking skills but is believed to have killed himself after being convicted for having sex with a male partner. The new 50-pound ($69) note features an image of Turing, mathematical formulae from a 1936 paper he wrote that laid the groundwork for modern computer science, and technical drawings for the machines used to decipher the Enigma code. The polymer note also carries a quote by Turing about the rise of machine intelligence: “This is only a...