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Equation 5 · Part 1 · The Longest Childhood: Life-History Theory and the Grandmother Bet

Symbol b

bb
bb

What this part means

b is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

b is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

…following year, using Eric Charnov’s dimensionless framework for comparing life-history variables across mammal species. Their comparison of fertility-rate parameters is precise: the annual birth-rate parameter they call b is 0.142 for humans against a range of 0.063 to 0.126 across the great apes they compare against, and the product of age at maturity and that fertility rate, α\alpha b , comes out to 2.05 for humans against 0.46 to 0.79 for apes [ 1 ] . Humans combine a maturation schedule that, on Charnov’s…

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