Durant was an American historian and essayist. In 1926, he published The Story of Philosophy, which soon became a bestseller. He then began a decades-long project—the writing of a comprehensive history of civilization. The result was The Story of Civilization, a monumental, 4,000,000-word, 10,000-page work stretching from prehistory to the 19th century. The series, published in 11 volumes from 1935 to 1975, introduced millions to intellectual history. Who coauthored the work? Discuss