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The historic discovery of the magnetic properties of lodestone led to the scientific understanding of Earth’s magnetic field. This series of computer-animated programs explores this mysterious force, from early observation to modern theories about the role of Earth’s magnetic field. 6-part series, 10 minutes each.



 
        

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The Determination of the Velocity of Light

The velocity of light is determined by focusing a deflected laser beam back and forth from a rotating mirror to a fixed mirror and measuring the deflection of the beam's image from its original path. The deflection of the beam is directly related to ...(more details)
 


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