Special element pins from Moscow State University. Third 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 Element 25 is indeed Manganese... Sorry, long day. 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