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ChemistryAtomic Theory IV
Our Atomic Theory series continues, exploring the quantum model of the atom in greater detail....
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Earth ScienceThe Phosphorus Cycle
All living organisms need phosphorous to survive and grow. This module describes forms that phosphorous...
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Scientists and ResearchRuth Benerito
Wrinkle-resistant cotton is one of the most significant developments of the 20th century. In the...
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