Decades before the American Revolution, Benjamin Franklin lamented that English settlers were constantly fleeing over to the Indians -- but Indians almost never did the same. Tribal society has been exerting an almost gravitational pull on Westerners for hundreds of years, and the reason lies deep in our evolutionary past as a communal species. The most recent example of that attraction is combat veterans who come home to find themselves missing the...

"On All Saints Day of 1755, the tremors from a magnitude 8.5 earthquake swept furiously from its epicenter in the Atlantic Ocean toward the Iberian Peninsula. Nowhere was it felt more than in Lisbon, then the thriving capital of a great global empire. In a few minutes most of Lisbon was destroyed -- but that was only the beginning. A tsunami swept away most of the ruined coast along the Tagus River and carried untold souls out to sea. When fire broke...