Ed Lester's team run their nanoparticle reactor for four days - but will it work? See the backstory at:    • Ed Lester & Nanoparticles   Ed works at the University of Nottingham. Promethean Particles is a spin-out company based on his breakthroughs. http://www.prometheanparticles.co.uk/ This film was shot and edited by James Hennessy. Test Tube is a project by video journalist Brady Haran for the University of Nottingham. More at http://www.test-tube.org.uk/