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ChemistryThe Periodic Table of Elements I
The modern periodic table is based on Dmitri Mendeleev’s 1896 observations that chemical elements can...
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Earth ScienceEarth's Atmosphere
Earth's atmosphere contains many components that can be measured in different ways. This module describes...
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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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