Here's the proof - the main video is at: https://youtu.be/FtNWzlfEQgY Featuring Zvezdelina Stankova - more videos with her at: http://bit.ly/zvezda_videos Pebbling a chess board: https://youtu.be/lFQGSGsXbXE 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