Around 100 CE, a huge metropolis began to emerge in the Basin of Mexico, one the Aztecs would later call Teotihuacan, or “Birthplace of the Gods.” It quickly came to dominate the region, and, with its completely new urban grid-plan, contained as many as 150,000 people. Its two gigantic buildings, the Pyramids of the Sun […]

Terence D. Capellini, Professor of Human Evolutionary Biology, Harvard University Being able to walk upright on two feet is a physical trait that distinguishes modern humans from our early ancestors. While the evolution of bipedalism has contributed to our success as a species, it has also limited the evolution of other features and increased our […]