Bibliography (7):

1. https://web.archive.org/web/20151208153024/https://en.wikipedia.org/wiki/NBA_league_average_height,_weight,_age_and_playing_experience

2. https://thesocietypages.org/socimages/2008/02/06/correlations-of-iq-with-income-and-wealth/

3. https://studysites.sagepub.com/schram/study/materials/reference/90851_04.2r.pdf

4. https://www.bmj.com/content/322/7290/819

5. https://www.wolframalpha.com/input/?i=male+height+distribution

6. https://infoproc.blogspot.com/2009/11/if-youre-so-smart-why-arent-you-rich.html

7. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Fastest_recorded_tennis_serves  :

      https://en.wikipedia.org/wiki/Fastest_recorded_tennis_serves