1. Copyright © InteractiveScienceTeacher.com Story of the Cell

2. Copyright © InteractiveScienceTeacher.com Story of the Cell Sand is silica dioxide When heated to 500°F it melts When that cools it becomes glass 1204- fall of Constantinople Turkish glassmakers cross the Mediterranean; settle in Venice 1291- for public safety, glassmakers sent to Island of Murano Discovery- glass can bend light in precise ways Reading glasses invented! (not much demand until…) Nature of their work + wood homes =lots of fires!

3. Copyright © InteractiveScienceTeacher.com 1440- Guttenberg invents the printing press; books are mass- produced Demand increases for reading glasses; become common 1. 2. 3.

4. Copyright © InteractiveScienceTeacher.com

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