Seventeen years ago, Ben Carson delivered a commencement address at Andrews University that featured a very unusual theory: Maybe Joseph built the pyramids to store grain. The speech itself, dug up by the ever-enterprising Andrew Kaczynski of BuzzFeed, was framed around Carson's trademark inspirational stories. "I thought that I would talk about my own personal philosophy for success in life," he told the graduating class. "Think big.? He used Joseph to illustrate the point. "Here was a man who was basically able to save the entire world with his big thinking," he mused. Joseph, in the biblical narrative, oversees the...