Pedometer on a Nuclear Submarine
Old Pierre was an optimist, or at least he seemed to be. On the French Navy's nuclear submarine "Dawn," he was responsible for cleaning the toilets. It wasn't a glamorous job, but Old Pierre always hummed a little tune as he scrubbed the toilets until they gleamed, as if he were completing a work of art. His optimism was like a thin film, enveloping the damp air inside this steel behemoth.
Every day, he would open his pedometer app. A free app called "Vitality Life" recorded his steps and calories burned. This app did more than it claimed. It recorded location, altitude, and movement trajectory. Inside the submarine, Pierre's "movement trajectory" looked comical; he traversed the narrow corridors back and forth like a lost crab.