Over four thousand years ago, the ancient Babylonians would make promises to their gods to return borrowed objects and pay off all their debts by the start of the new year. A couple of thousand years later, as the Romans entered their new year, they made all kinds of promises to their god, Janus, for whom January is named.
Switch to LED lights. They've come a long way from their early days of blinding color. Not only have they perfected the design, but LEDs last almost a 100 times longer and use 90% less electricity than incandescent bulbs! And you can string ten strands together, a big jump from the old three-strand maximum. That means less extension cords.