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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 activity, learners use a realistic mass and spring laboratory. They hang masses from springs and adjust the spring stiffness and damping. Learners can even slow time and transport...

    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
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    PhET
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    In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Learners will visualize the relative...

    Ages 11 - adult