Human brains are, first and foremost, kinship engines. In senile dementia, gradually all knowledge and ability drops out—including names of your children. But you still remember who’s related to whom. That’s the last thing to go.
It is extremely strange, the things that drop out, and the things that stick… One family member could argue about the 3D structure of the serotonin receptor protein until the day she died, but thought Nixon was president and didn’t know her own phone number
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