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number symbolism, cultural associations—including religious, philosophical, and aesthetic—with various numbers. Humanity has had a love-hate relationship with numbers from the earliest times. Bones dating from perhaps 30,000 years ago show scratch marks that possibly represent the phases of the Moon. The ancient Babylonians observed the movements of the planets, recorded them as numbers, and used them to predict eclipses and other astronomical phenomena. The priesthood of ancient Egypt used numbers to predict the flooding of...