The Pre-persons
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"The Pre-persons" is a science fiction short story by American writer Philip K. Dick. It was first published in Fantasy and Science Fiction magazine, October 1974.
The story was a pro-life response to Roe v. Wade. Dick imagines a future where the United States Congress has decided that abortion is legal until the soul enters the body. The specific instant is defined by the administration, at present the moment a person has the ability to perform simple algebraic calculations (around the age of 12).
The main protester — a former Stanford mathematics major — demands to be taken to the abortion center, since he claims to have forgotten all his algebra.