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Smithsonian Institution
Water/Ways: The Poetry of Science
Water is the source of life. It appears in poetry in both peaceful and torrential descriptions; it appears in earth science in its liquid, gaseous, and solid states. Combine these interpretations of our planet's most precious and...
Curated OER
What is pH?
Young scholars describe pH and the importance of it in the natural world. In this Biology lesson students compare the pH of different mixtures.