http://www.nature.com/news/2011/110420/full/472280a.html May be worth a read. Ian (Alias Beefy)
PostgraduateForum Is a trading name of FindAUniversity LtdFindAUniversity Ltd, 77 Sidney St, Sheffield, S1 4RG, UK. Tel +44 (0) 114 268 4940 Fax: +44 (0) 114 268 5766