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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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Scientists and ResearchRuth Benerito
Wrinkle-resistant cotton is one of the most significant developments of the 20th century. In the...
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General ScienceTemperature
An introduction to the relationship between energy, heat and temperature. This lesson compares the 3...
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