Sources: https://fee.org/articles/harvard-study-gender-pay-gap-explained-entirely-by-work-choices-of-men-and-women/
https://www.payscale.com/gender-lifetime-earnings-gap
https://www.forbes.com/sites/ccap/2012/02/16/the-male-female-ratio-in-college/?sh=4ea7b4cbfa52
https://www.theguardian.com/money/2015/aug/29/women-in-20s-earn-more-men-same-age-study-finds
https://www.medscape.com/viewarticle/922503
