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Earth ScienceDeep Time
Have you ever wondered: Just how old is Earth? If so, you’re in good company....
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PhysicsThe Nature of Light
For centuries, controversy over whether light is made of particles or waves abounded. This module...
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Scientists and ResearchUncovering the Mysteries of Chronic Mountain Sickness
The air has less oxygen at high altitudes, and the physiology of the body changes...
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