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ChemistryThe Periodic Table of Elements II
This module traces the history of the periodic table of the elements. In the mid-1800s,...
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BiologyPaleontology and the Fossil Record
Paleontologists study fossils to understand ancient organisms. While fossils might look simple enough, they provide...
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Earth ScienceHistory of Earth's Atmosphere I
This module looks at how the Earth's atmosphere has changed since the planet came into...
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