An earlier version of this story did not explain that William Friedman’s photo did not spell out the entire secret message “knowledge is power.” There were not enough people in the photo to complete ...
Two summers ago, I found myself face to face with a 400-year-old mystery. I was trying to escape the maze of books at Firsts, London’s Rare Book Fair, in Battersea Park. The fair was a tangle of ...
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