Betrayals of trust: Human nature’s dark side may have helped us spread across the world

http://www.sciencedaily.com/releases/2015/11/151124204330.htm

New research suggests that betrayals of trust were the missing link in understanding the rapid spread of our own species around the world. Moral disputes motivated by broken trust and a sense of betrayal became more frequent and motivated early humans to put distance between them and their rivals.

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