Before technology made it possible for an entire set of lights to stay lit when a single bulb burned out, my uncle spent hours trying to find that one “bad” bulb. Strands of lights stretching from one end of the living room to the other, he’d twist the colored bulbs out of their sockets one-by-one, replacing them with a “tester” bulb. If a modern-day citizen would have to spend hours locating one burned out bulb in order to get a strand of lights working today, I dare say more homes would be dark than dazzling this time of year.