A woman in Cheyenne, Wyoming, says her mom used to refer to the cloudy scum that sometimes forms atop vinegar as mother. The term has been around at least 500 years, and can refer to the scum on the top or sediment on the bottom. It’s also used as a verb, and a liquid with that kind of surface can be described with the adjective mothery. A similar cloudy substance that forms atop old wine is called a wineflower. This is part of a complete episode.