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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 ResearchFranklin Chang Díaz
Franklin Chang Díaz, the first Latin American to travel to space, ties the record for...
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BiologyThe Piltdown Hoax
The Piltdown Man was once hailed as the "missing link" in the evolution of apes...
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