"'There are two genders' is the Newtonian physics of human sexuality: it works most of the time but it's not the whole picture. It's pretty adequate for most people's needs but doesn't stand up to scrutiny and is riddled with so many exceptions as to be obviously untrue." -- Magdalene Visaggio (MagsVisaggs), 2018-07-13 (analogy to quantum vs Newtonian continues in thread)