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Color Vision

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...

free Ages 6 - adult 5 to 10 minutes
Estimation

PhET
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In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement. This activity includes an...

free Ages 6 - adult 10 to 30 minutes