Apparent altruism is usually gene-level accounting — kin selection and reciprocity, not group benevolence.
Hamilton’s rule with the joke attached: half your genes in a sibling, an eighth in a cousin, so lay down your life for two brothers or eight cousins.
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Typed edges. Anything below the line was authored on the other note and derived here.
example-of →Selection acts on genes, not individuals or species — the organism is the vehicle the gene builds to copy itself.The clearest demonstration of the lens paying off: behaviour that is inexplicable as individual self-interest is straightforward once the gene is the accounting unit.