Videos make many aspects of science and engineering much clearer. Below are some useful links
You can find a great video on Prince Rupert's Drops (§21.4.1) on this youtube site. The video used a high-speed camera to observe how the drop shatters.
The Corning site is another great source of videos on glass (Chapter 21). Your library should be able to provide access to these.
There are also many videos on Dale Chihuly (Chapter 21). Dale is the inspiration to many who work with glass.