On Wed, December 31, 2008 07:31, Gregory Fraser wrote: > Around 2 a.m. tomorrow morning, when you want to prove to that traffic > cop that you are in fact not inebriated, explain this to him (or her). > Atomically or molecularly, what is it about glass that lets light pass > through it? Do photons pass between the glass molecules? Does the glass > absorb light energy on one surface and emit it out the opposite surface? > What is different between glass and lead that allows the light through > glass and not lead? Awwwww...you expanded the question out to make it really clear what you're asking. And here I was all set to respond just to the subject line -- "Because it's too far to go around!" -- David Dyer-Bennet, dd-b@xxxxxxxx; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info