+https://www.wired.com/2009/03/designerdebate/
+cellular-level sex differences http://www.physiology.org/doi/abs/10.1152/ajpcell.00281.2013
+
+Effects of prenatal androgens on rhesus monkeys https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3146061/
+
+https://theestablishment.co/why-we-must-stop-calling-menstruation-a-womens-issue-a9c58c677f7c
+
+https://twitter.com/BretWeinstein/status/969660864641953792
+
+https://www.teenvogue.com/story/9-things-people-get-wrong-about-being-non-binary
+
+60,000 likes for "Some men have a uterus": https://twitter.com/PPIndKentucky/status/969384341636861952
+
+https://en.wikipedia.org/wiki/Radical_flank_effect
+
+demography: https://twitter.com/conradhackett/status/974750991756283904