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    Computer Science Unplugged
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    This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships. This activity demonstrates three search...

    Ages 8 - adult
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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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    Computer Science Unplugged
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    This activity introduces the idea that computer scientists measure information by how "surprising" a message is. Learners play the game "20 Questions" and use the number of...

    Ages 8 - 14
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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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    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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    Computer Science Unplugged
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    This magic trick is based on how computers detect and correct data errors. In the trick, a volunteer lays out a 5 x 5 square of identical cards colored on one side, with a random mix of sides...

    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