Deter Prying Eyes by Locking Your Own...
It was spring in England, and Sir Robert Cecil—Secretary of State for King James VI and I—was not happy. “I have also sent you a piece of paper folded as gentlemen use to write their letters,” he wrote to his teenage son, William, “whereas yours are like those that come out of a grammar school.” The scolding tone is timeless; William’s offense, however, is a bit dated. In the early 17th century, mass-produced envelopes had yet to be invented…….

















