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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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    PhET
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    In this online interactive simulation, learners will add different salts to water and then watch the salts dissolve and achieve a dynamic equilibrium with solid precipitate. Learners will also...

    Ages 8 - 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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    PhET
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    In this online activity, learners will brush up on their multiplication, division, and factoring skills with this exciting game. This activity includes an online simulation, sample learning goals,...

    Ages 8 - adult