In Seven, Jacqueline Leo explains the many valuable ways the number 7 can be a tool to define time, synthesize ideas, and keep one's mind and memory performing at top speed. Leo explores the powerful utility of 7 throughout cultures and the ages. Why are there 7 wonders of the world, 7 seas, 7 ages of man, 7 levels of hell, 7 primary colors, 7 whole notes of the musical scale, and 7 days of the week? And why, when asked to choose a number between 1 and 10, do most people choose 7?
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