Scientific American Sep 2018

74 Scientific American September 20 18

“We”

before

“me”

Morality

of right and

wrong

Self-

interest

6 million

years before

present

400000

years before

present

100000

years before

present

Collaborative

foraging

Pressure

for cultural

organization

Illustration by Portia Sloan Rollings

Evolution of Modern Human Morality

Animals often cooperate with others of their own species. But the way

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