How Fast Can We Go

http://www.aims-worldrunning.org/articles/427.html
https://en.wikipedia.org/wiki/Ancient_Olympic_Games
https://www.olympic.org/ancient-olympic-games/the-athlete
http://www.bbc.com/news/magazine-37033910
http://www.huffingtonpost.co.uk/entry/leonidas-of-rhodes-michael-phelps-2000-year-on_uk_57ad9632e4b0f475601bb2a5
http://www.runnersworld.com/newswire/ultimate-100-meter-time-927-seconds
http://www.runnersworld.com/marathon/these-are-the-worlds-fastest-marathoners-and-marathon-courses
http://www.telegraph.co.uk/sport/olympics/athletics/9450234/100m-final-how-fast-could-you-run-it.html
http://www.huffingtonpost.co.uk/entry/fitness-study-one-in-five-cannot-run-further-than-100-metres_uk_57021f9fe4b0c5bd919b4f7d
https://www.bhf.org.uk/
https://en.wikipedia.org/wiki/Dean_Karnazes
http://myswimpro.com/blog/2015/05/30/over-4-billion-people-cant-swim/
http://time.com/106912/red-cross-swimming-campaign/
https://www.bustle.com/p/can-a-human-swim-faster-than-a-shark-michael-phelps-is-trying-to-beat-nature-at-its-own-game-70707
https://www.wired.com/2012/08/olympics-physics-swimming/
https://www.bustle.com/p/is-michael-phelps-the-fastest-swimmer-in-the-world-hes-a-top-human-competitor-for-a-shark-70345
http://www.vanityfair.com/hollywood/2017/07/michael-phelps-shark-race-discovery-shark-week
https://www.space.com/11337-human-spaceflight-records-50th-anniversary.html
https://en.wikipedia.org/wiki/List_of_vehicle_speed_records
http://www.telegraph.co.uk/motoring/news/7876597/Top-10-worlds-fastest-road-cars.html
https://en.wikipedia.org/wiki/Ack_Attack
https://en.wikipedia.org/wiki/Fred_Rompelberg
http://www.bbc.co.uk/newsround/21229721
https://en.wikipedia.org/wiki/North_American_X-15
https://www.forbes.com/sites/quora/2017/03/11/why-doesnt-the-united-states-have-high-speed-bullet-trains-like-europe-and-asia/#35034f45c080
http://www.nationalaviation.org/our-enshrinees/knight-william/
https://www.manufacturing.net/news/2016/03/why-there-still-no-high-speed-rail-network-america
https://www.wired.com/2003/03/cheating/
http://www.telegraph.co.uk/travel/cruises/galleries/ss-united-states-in-pictures/