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    WGBH
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    In this activity, learners use a soda can to decode a secret message. Learners wrap scytale (pronounced ski-tally) code around a can and challenge friends to see if they can crack the codes....

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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    WGBH
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    In this activity, challenge learners to design a roller coaster ride for a marble using cardboard and other simple materials. The goal is to have the marble go slow, so it takes as long as possible...

    $1 - $5 per student Ages 6 - 11 30 to 45 minutes
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    NISE Network
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    In this activity, learners assemble large cubes to make nano-related images. Learners discover how different objects are related to nanoscience and nanotechnology.

    $10 - $20 per group Ages 4 - adult 10 to 30 minutes
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    WGBH
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    In this optics activity, learners build a spy tool to secretly view things over walls or around corners. Learners discover that the mirrors inside the periscope reflect light to help you see what&...

    $5 - $10 per student Ages 6 - 11 10 to 30 minutes
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    WGBH
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    This event guide features three related explorations in which learners investigate the following science concepts: how you design and build a structure helps determine how strong it will be;...

    $5 - $10 per group Ages 4 - 6 45 to 60 minutes
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    Twin Cities Public Television
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    In this engineering activity, learners explore simple machines and then build cardboard automata using cams. Learners are also challenged to build a complex machine--a moving sculpture that tells a...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours