About 70-90 Percent of a Society Needs to Die Before It Completely Collapses

Published: Jan. 25, 2018, 8:07 a.m.

Some disasters hurt society (Hurricane Katrina in 2005). Bigger ones permanently alter it (the Black Death in the 1300s; Mao's Great Leap Forward). The worst of disasters completely destroy a civilization and leave behind so few they take centuries...