Glass - A New Wonder Material
Clip: Episode 1 | 4m 9s | Video has closed captioning.
Learn how clear glass was born - and gave us spectacles almost 800 years ago.
The full episode is no longer available for online streaming. Why?
Please continue to enjoy extra(s) from this episode. The full episode is still available for purchase through the "Buy Now" links.
Problems Playing Video? | Closed Captioning