Brady meets some of the people who make science videos for YouTube - and in true Sixty Symbols fashion asks them about their symbols. Featuring ViHart, Smarter Every Day, CGPGrey, Veritasium and Minute Physics. Extra footage from Destin at http://www.youtube.com/watch?v=olIBVZX7n8E Extra footage from Henry Reich at http://www.youtube.com/watch?v=YoQcg39Krvk Extra footage from Derek Muller at http://www.youtube.com/watch?v=z6RFcs2-Jv4 Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/#!/periodicvideos Sixty Symbols videos by Brady Haran Brady's other channels include: http://www.youtube.com/periodicvideos (Chemistry stuff) http://www.youtube.com/numberphile (Numbers and maths) http://www.youtube.com/DeepSkyVideos (Space stuff) http://www.youtube.com/nottinghamscience (Science and behind the scenes) http://www.youtube.com/foodskey (Food science) http://www.youtube.com/BackstageScience (Big science facilities) http://www.youtube.com/favscientist (Favourite scientists) http://www.youtube.com/bibledex (Academic look at the Bible) http://www.youtube.com/wordsoftheworld (Modern language and culture) http://www.youtube.com/PhilosophyFile (Philosophy stuff)