Curated OER
Harnessing the Wind for Electricity
Ninth graders explain how wind can produce electricity. For this geometry lesson, 9th graders construct their own pin wheel turbine and calculate its power. They discuss the pros and cons of using wind generator.
Curated OER
Etc: Maps Etc: Route of the Panama Isthmian Canal, 1904
A map from 1904 of the Panama Canal showing terrain relief of the isthmus, noting the 'Canal always follows the line of the Railroad’ from Colon to the city of Panama. "For generations the Panama Canal had been the dream of man and for...