It's our favourite "Barking Dog" experiment - but in a new position. Previous Barking Dog videos: http://bit.ly/Barking_Dog Featuring The Professor (Sir Martyn Poliakoff) and senior technician Neil Barnes. 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