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Chemistry
The Periodic Table of Elements I

The modern periodic table is based on Dmitri Mendeleev’s 1896 observations that chemical elements can...
Scientists and Research
Luis Walter Alvarez

Luis Alvarez is less famous for his Nobel prize-winning research into subatomic particles than for...
Earth Science
The Phosphorus Cycle

All living organisms need phosphorous to survive and grow. This module describes forms that phosphorous...

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The Periodic Table of Elements I