https://en.wikipedia.org/wiki/Trivers%E2%80%93Willard_hypothesis
http://wordpress.mrreid.org/2012/10/15/the-trivers-willard-hypothesis/
https://www.cambridge.org/core/journals/journal-of-biosocial-science/article/parental-background-and-daughters-and-sons-educational-outcomes-application-of-the-triverswillard-hypothesis/47FD4388B618EB5E078336813FEB71E3