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    Computer Science Unplugged
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    In this activity, learners listen to songs and decode hidden messages based on the same principle as a modem. As a final challenge, learners decode the binary messages in a music video. This is an...

    free Ages 6 - 18 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners use a compact disc to make a spectrometer, an instrument used to measure properties of light. Learners use their spectrometer to view a continuous spectrum produced by...

    $1 - $5 per student Ages 11 - 18 30 to 45 minutes
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    NOAA
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    In this activity, learners will listen to as many radio stations as possible to discover that AM radio signals can travel many hundreds of miles at night. Learners log the call signs, locations,...

    free Ages 8 - 18 1 to 2 hours
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    The Exploratorium
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    In this group activity, learners see and hear the speed of sound. A learner designated the "gonger" hits a gong, once every second, as the rest of the group watches and listens from a...

    $1 - $5 per group Ages 11 - 18 10 to 30 minutes
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    NISE Network
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    In this activity/demo about piezoelectricity, learners discover how some crystals produce electricity when squeezed. Learners investigate the history of piezoelectricity, how it's used, and...

    Over $20 per group Ages 4 - adult 10 to 30 minutes

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