An “us vs. them” world tends to produce belief in cultural superiority. But human beings share more in common than perceived—and, admittedly, sometimes real—differences that may separate us. Exhibit A: Teotihuacan. Teotihuacan is a sprawling pre-Columbian archaeological site northeast of Mexico City. Famed for its huge pyramids, Teotihuacan once contained 125,000 residents. Carolyn and I…

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