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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 ScienceDeep Time
Have you ever wondered: Just how old is Earth? If so, you’re in good company....
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ChemistryThe Periodic Table of Elements V
The periodic table allows us to easily view the 118 known chemical elements according to...
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