The one thing that might be said for societal collapse is that—for a while at least—everyone is equal. In 1915 an earthquake killed 30,000 people in Avezzano, Italy, in less than a minute. The worst-hit areas had a mortality rate of 96 percent. The rich were killed along with the poor, and virtually everyone who survived was immediately thrust into the most basic struggle for survival: they needed food, they needed water, they needed shelter, and they needed to rescue the living and bury the dead. In that sense, plate tectonics under the town of Avezzano managed to re-create the communal conditions of our evolutionary past quite well. “An earthquake achieves what the law promises but does not in practice maintain,” one of the survivors wrote. “The equality of all men."