Why is glass transparent?

Professor Philip Moriarty, University of Nottingham, is shedding light on the difference between opaque and transparent materials.

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)

Anna Carlgren