follow @tweetsauce NEW extreme sports channels with special messages for Vsauce: RIDEchannel (Tony Hawk): http://bit.ly/xxao37 AlliSports: http://bit.ly/wwdKqB NetworkA: http://bit.ly/A8vwRc ALL MUSIC COURTESY http://www.soundcloud.com/JakeChudnow History of the Motorcycle: http://en.wikipedia.org/wiki/Motorcycle First FMX back flip: https://www.youtube.com/watch?v=BUAt5WwtaX0 First motocross TRIPLE back flip: https://www.youtube.com/watch?v=4eTMDkbS0fc Back flips limit calculation: http://extremesportsphysics.blogspot.com/2007/07/fmx-backflips-limit-14.html Swing Physics: http://www.exploratorium.edu/skateboarding/trick04.html Center of mass Magic: https://www.youtube.com/watch?v=PgANeYMT8X8 Outrun avalanche: http://extremesportsphysics.blogspot.com/2007/10/popscis-extreme-sports-error.html snowboard with avalanche video: https://www.youtube.com/watch?v=0P_kza7pJFM gees felt by snowboarder: http://extremesportsphysics.blogspot.com/2007/10/anatomy-of-monster-aerial.html shuttle launch: https://www.youtube.com/watch?v=4FROxZ5i67k 400,000g bacteria: http://news.nationalgeographic.com/news/2011/04/110425-gravity-extreme-bacteria-e-coli-alien-life-space-science/ gees snowboard pic: http://www.flickr.com/photos/glennybig/470051575/sizes/z/in/photostream/ Euthanasia Coaster: http://www.julijonasurbonas.lt/p/euthanasia-coaster/ Kittenger SPACE JUMP: https://www.youtube.com/watch?v=90Y0_iJrRl0 REDBULL Space Jump: http://www.redbullstratos.com/