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ChemistryEarly Ideas about Matter
Tracking the development of our understanding of the atomic structure of matter, this module begins...
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Scientists and ResearchLouis Tompkins Wright
In the first two decades of the 20th century, job opportunities for African American physicians...
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Earth ScienceOrigins of Plate Tectonic Theory
The theory of continental drift was the first step toward plate tectonic theory, which became...
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