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    PhET
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    In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light. They can also...

    Ages 6 - adult
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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 (remove)
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