https://grantland.com/features/the-lost-art-doctoring-baseball/
https://www.mlb.com/glossary/rules/doctoring-the-baseball
https://www.baseball-reference.com/bullpen/Spitball
https://www.baseball-reference.com/bullpen/Doctoring_the_Baseball
https://www.lonestarball.com/2006/10/28/234914/81
https://www.si.com/mlb/2021/06/04/sticky-stuff-is-the-new-steroids-daily-cover
https://blogs.fangraphs.com/lets-take-another-stab-at-unpacking-the-rising-strikeout-rate/
https://apnews.com/article/tx-state-wire-chicago-white-sox-mlb-baseball-sports-c045305ea927623835c7387c8e7f6407
https://www.nydailynews.com/sports/baseball/yankees/ny-yankees-gerrit-cole-20210607-5inbuzucgna7zflbpwlsbdrhrq-story.html
Eric Sim
https://www.baseball-reference.com/leagues/MLB/bat.shtml
https://apnews.com/article/tx-state-wire-chicago-white-sox-mlb-baseball-sports-c045305ea927623835c7387c8e7f6407