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The Physics Source is a collection of resources for introductory college level physics courses. It includes curriculum, curriculum support material, reference material, and pedagogical and physics education research inspired content.

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Community project to update physics for the life sciences
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Evidence-based methods for teaching physics.
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October 21th History

1872: Jacques Babinet died in Paris, France. He suggested using the wavelength of light as the unit of standard measure in 1827. Today the standard meter is based upon the wavelength of krypton gas.
Source: Physics Infomall.