Miscellany
In 1956 psychologist George Miller published a paper that claimed the average number of objects a typical human can hold in short-term memory is seven (plus or minus two). “What about the magical number seven?” he wrote. “What about the seven wonders of the world, the seven seas, the seven deadly sins, the seven daughters of Atlas in the Pleiades, the seven ages of man, the seven levels of hell, the seven primary colors, the seven notes of the musical scale, and the seven days of the week?”