Professor Philip Moriarty studies nanoparticles at the University of Nottingham, and explains in this short movie, the difference between an opaque and a transparent material:
· http://www.sixtysymbols.com/videos/energygap.htm
Astronomer Dr. Amanda Bauer who researches galaxy formation talks about photons and as a quite wonderful extra little surprise, she will also speak about why the sky is blue during the day and orange/red during sunrise and sunset:
· http://www.sixtysymbols.com/videos/photons.htm
(FlashPlayer is required)
