For periodic table enthusiasts like us, this clock is pretty amazing! A video on every element: http://bit.ly/118elements Watches on Numberphile: http://youtu.be/kOClr_bew38 Here are some periodic table clocks, but alas not the main one in this video... US: http://amzn.to/W35Fbe UK: http://amzn.to/1q3jbc0 More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos From the School of Chemistry at The University of Nottingham: http://bit.ly/NottChem Periodic Videos films are by video journalist Brady Haran: http://www.bradyharan.com/ A run-down of Brady's channels: http://bit.ly/bradychannels