A strange little side quest
Between one round of Switch Off: Turn Off All the Lights and the next, this is worth knowing: The first crossword puzzle book appeared in 1924 in a cautious initial printing of 3,600 copies, complete with a free pencil. The timeline takes another interesting turn: In 1958, Tennis for Two used an analog computer and an oscilloscope to turn simple physics into a playable tennis-like demonstration. That long chain of experiments is part of why puzzles still feels fresh when a game finds the right twist.
