Okay, that’s probably an overstatement. The heart-lung machine, or whatever they call the device that keeps people alive during heart transplants. The airplane, at least before the industry got so ridiculous about cramming people in like sardines, and now is paying for it in spades because social distancing prevents them from doing this. The can opener. The piano. Innumerable vaccines. Ball-point pens. Deodorant. Motor vehicles. Computers. The pump that brings water up from a deep well. Air conditioning.