It seems to me that in modern society natural selection (as a positive force for improvement of the species) is effectively working backwards.
On the whole the more intelligent seem to put off having kids until later, building the resources to maintain a family and then have 1 or 2.
Walking around town during the day I see pregnant women in their early 20s ushering around 4 kids while her partner staggers on carrying a can of lager and screaming obscenities at his darling offspring. They must all work nightshift or something.
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