“[M]athematicians and codes are well connected in history. One of my predecessors at Oxford was the {{w|Savilian Professor of Geometry}}, Wallis, famous for his formula for pi, and... very popular with both sides in the Civil War... [L]ike von Braun after... [World War 2,].., captured by the enemy, he... went to work on doing codes the other way around. As a mathematician he could survive the civil war... comfortably. ...If you want to survive difficult times... be a mathematician.”