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🧵 Biology textbooks move with the Zeitgeist. “The biochemical, physiological, and anatomical features associated with ‘males’ and ‘females’ are turning out to be more complicated than previously thought, with many genes involved in their development.” 👍. 2016, from: 
Moreover, “A newborn baby is assigned a ‘biological sex’ that typically reflects the genitals present at birth and the child’s chromosomes.” 🧐
And: “Although most individuals are born male or female, roughly one in 100 is intersex.” 1% of babies are not born female or male! Citation? (At least it’s not the old 1.7% chestnut.) 🧐
🎩 @NickJMatzke /ends.
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