This was recorded on 3 December, 2012. The Professors (from left to right): Ed Copeland (sixtsymbols and numberphile) Martyn Poliakoff (periodicvideos) Mike Merrifield (sixtysymbols and deepskyvideos) Phil Moriarty (sixtysymbols and numberphile) All based at the University of Nottingham. http://www.youtube.com/periodicvideos (Chemistry stuff) http://www.youtube.com/sixtysymbols (Physics and astronomy) http://www.youtube.com/numberphile (Numbers and maths)