UK Professor Phil Moriarty discusses what makes glass appear transparent in this video by the Sixty Symbols - a collection of videos about physics and astronomy presented by experts from The University of Nottingham.
A photon checks into a hotel. The bell hop asks him " Can I help you with your luggage?" To which the photon replies, "I don't have any. I'm traveling light."
I still have no idea why glass is transparent, but his accent is so good that he doesn't need to pronounce words right. I guess his explanation didn't have enough energy and passed right true me. He must assume I know something about being excited.
Previous Glass Fun Facts postings:
Glass Fun Facts: Gaffer/Composer
More Glass Fun Facts: Bullseye Glass
Float Glass Fun Facts
Glass Fun Facts - Shattered Glass Predicts Weather
Historical Glass Fun Facts - How the Invention of Pyrex and The Studio Glass Movement are Connected.