Read pg 20 - The Plow in the book, "The Way Things Work" Watch Videos: Plowing - Michael Duvall - 3:23 min How it’s made: Snow Plows -...

BREAKTHROUGH: THE IDEAS THAT CHANGED THE WORLD The Telescope Meet the brilliant minds throughout history, from Galileo to Edwin Hubble,...

Lecture: Who invented the telescope? Notes from Space.com: The telescope is one of humankind's most important inventions. The simple...