Sam Leith Sam Leith

Our long, vulnerable childhoods may be the key to our success

Why humans invest so much more time and effort in raising their offspring than other animals

The role of a grandmother in contributing to the reproductive fitness of her genetic line is emphasised by Brenna Hassett. [Getty Images] 
issue 13 August 2022

The central question in Brenna Hassett’s book, put simply, is: why are our children so very useless for so very long? Or: ‘What is the possible adaptive value of teenagers?’ If we consider maturity, or adulthood, to be the point at which an animal can play its own role in the evolutionary process – i.e.

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