Gender fluid

Angela Saini writes (“What is a woman?, Aug/ Sept) that “the biological meaning of sex has not been exhaustively settled… Until it is… whatever meaning it has is whatever meaning we have chosen to give it. It remains up to us.”

The extraordinary nature of this statement becomes clear as soon as it is applied to any other area of science: “The precise nature of dark matter is still a mystery, so we can define it however we like!”

A bizarre non sequitur, unlikely to advance understanding—in any discipline.

Ruth Davis, Basingstoke

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