Robert Heinlein in I Will Fear No Evil (1970) predicts that by early 21st century "young people" will claim there are "six sexes" -- and likely be undercounting.pic.twitter.com/NTII9ZAJMm
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Huh, I didn’t know that. It is definitely wobbly in the characterization early in the book, which I imagine RAH would have ironed out with a second draft.
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