For most of history, parents buried about half their children before fifteen.
Now 96 in 100 make it.
A child born in 1800 could expect fewer than 30 years. One born in 2024 can expect 73.
18 chapters, 26 centuries. The case for the species.
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@Daojoan That is at most an expectation that people can live to be 73. You don't know what will happen by then. And given the climate, etc., it seems quite ‘optimistic’ to me.