In an original version of a 1996 Bill Nye the Science Guy episode, called "Probability," a young girl explains that it's your chromosomes that determine your sex and gender, which there are two of, not 97. This segment has now been removed entirely from the Netflix version of the episode. The Ministry of Truth has made sure that Nye has always believed gender is fluid.
"I'm a girl. Could have just as easily been a boy, though, because the probability of becoming a girl is always 1 in 2," says the young girl in the original episode.
"See, inside each of our cells are these things called chromosomes, and they control whether we become a boy or a girl," she continues. "See, there are only two possibilities: XX, a girl, or XY, a boy."