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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 ScienceOrigins of Plate Tectonic Theory
The theory of continental drift was the first step toward plate tectonic theory, which became...
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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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