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How can we explain simultaneously this general pattern of female parental care and also its numerous exceptions?
The answer comes from the realization that genes for behavior, as well as for malaria resistance and teeth, are subject to natural selection.

— Jared Diamond Why Is Sex Fun?: The Evolution of Human Sexuality (1997)

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More quotes by Jared Diamond

History, as well as life itself, is complicated; neither life nor history is an enterprise for those who seek simplicity and consistency.

Collapse: How Societies Choose to Fail or Succeed (2005)

My hope in writing this book has been that enough people will choose to profit from that opportunity to make a difference.

Collapse: How Societies Choose to Fail or Succeed (2005)

Our sex is ultimately laid down by our genes.

Why Is Sex Fun?: The Evolution of Human Sexuality (1997)

Behavior evolves through natural selection, just as anatomy does. Hence if sex is enjoyable, natural selection must have been responsible for that outcome.

Why Is Sex Fun?: The Evolution of Human Sexuality (1997)

Remember that impact is the product of two factors: population multiplied times impact per person.

Collapse: How Societies Choose to Fail or Succeed (2005)

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Attribution

Quote text and notes from Wikiquote: Jared Diamond (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.