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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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Scientists and ResearchPercy Lavon Julian
The module traces the life and career of organic chemist Percy Julian, who developed a...
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Scientists and ResearchAn Elegant Experiment to Test the Process of DNA Replication
Testing predictions is a major part of scientific research, and a key component of many...
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