1. Do Cathedral Window glasses flow? The importance of glass North Rose Window, Cathedral of Chartre

2. Can glass flow at room temperature? Are glasses liquids or solids?

4. What does it mean to be a:  Solid  Liquid  Gas Are glasses liquids or solids?

5. Gas:  Widely spaced  Non-interacting  Fast moving

6. Liquid:  Closely, randomly packed  Interacting  slowly moving (flowing)

7. Crystalline solid:  Densely packed  Well ordered  Not moving (still vibrating!)

8. Crystalline solids

9. Can you slow a liquid down without it crystallizing? Water Honey

10. Temperature IS molecular motion http://www.falstad.com/gas/

11. A GLASS is just a really, really slow liquid How slow? Can it flow on human timescales?

12. Zanotto, Am. J. Phys., Vol. 66, No. 5, May 1998 Calculations of flow rates predict the relaxation time for glass: 2 x 10 23 years A million billion billion years!

14. So why are windows warped? Making Crown glass:

18. Other glasses: beyond windows Plastics Metals

19. Other glasses: beyond windows Biology:  Hibernation

20. Other glasses: beyond windows Medical drugs  Bioavailability  Storage