Read pg - 42 - 43 - Spur Gears - in the book "The Way Things Work" Watch Videos: Gear Basics - Science Online - science online - 10:58...

Read pg 40 - 41 - Gears and Belts in book "The Way Things Work" Watch Videos: What’s a Gear to Do - Children’s Museum Houston - 3:08 min...

6:45 PM ​Speaker: The History of Celestial Cartography - The Evolution of Art and Science in Early Printed Star Atlases