From slaves’ rectums to porn vids, there are few places people haven’t tried to conceal secret messages
From our UK edition
John Gerard, a Jesuit priest immured in the Tower of London in 1597, and tortured by being hung from manacles until he temporarily lost the use of his arms, was a resourceful as well as courageous fellow. Dependent on the kindness of his jailer, a warder named Bonner, for such intimacies as washing, dressing and shaving, Gerard also persuaded the turnkey to bring him a bag of oranges. Regaining the use of his hands, he employed the fruit for two purposes: to fashion crosses and rosaries from the discarded peel, and to make invisible ink from the juice.