Main video is at: https://www.youtube.com/watch?v=0X9DYRLmTNY - Featuring Tony Padilla... Supporting #TeamTrees on a quest to plant 20 million trees - https://www.teamtrees.org/ (Original brown papers from this video available to support the campaign - http://bit.ly/brownpapers) Do Numbers Exist: https://www.youtube.com/watch?v=1EGDCh75SpQ Big Numbers: http://bit.ly/Big_Numbers More on Graham's Number: https://www.youtube.com/watch?v=XTeJ64KD5cg Ron Graham videos: http://bit.ly/Ron_Graham More on TREE(3): https://www.youtube.com/watch?v=3P6DWAwwViU Moon Trees: https://www.youtube.com/watch?v=6qGbkFhxYhs Video guides to Tree Species: http://bit.ly/TreesPlants NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Support us on Patreon: http://www.patreon.com/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ A run-down of Brady's channels: http://www.bradyharan.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9