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    National Optical Astronomy Observatory
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    In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database. This popular program has generated 100,000...

    Ages 4 - adult
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    Oregon Museum of Science and Industry
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    This guide outlines how to plant a garden even if you don't have a yard! It gives advice on how to prepare a container for plants and how to cultivate seedlings so they can grow enough to be...

    Ages 8 - adult
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    The Exploratorium
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    In this math activity, learners observe and sketch cracking patterns in pavement. Learners use a protractor to measure and label the angles of their sketches and conclude if some angles are more...

    Ages 11 - 18