A glow-in-the-dark guitar plectrum. Fifth of 12 parts, each featuring chemistry gifts received by Sir Martyn during the year. All the videos in this series appear here as they're released: http://bit.ly/12_Days_Xmas Drumming: https://www.youtube.com/watch?v=GyLeBMdI_HU Objectivity: http://bit.ly/Objectivity 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/ Brady's Blog: http://www.bradyharanblog.com Join Brady's mailing list for updates and extra stuff --- http://eepurl.com/YdjL9