Takin' One For The Team

While those who ask and attempt to answer questions about evolution remain flummoxed by the evolutionary origin of altruism, a new hypothesis may be emerging: Perhaps it was selected for because of the survival advantage it gave to stone age combat groups.
A computer model of cultural evolution and between-group competition primed with data taken from studies of mankind’s hyper-violent early years suggests a bloody origin for a celebrated modern behavior.

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