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    Computer Science Unplugged
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    In this puzzle, learners investigate the decisions involved in linking a network between houses in a muddy city. It can lead on to a discussion of minimal spanning tree algorithms for optimizing...

    1 cent - $1 per student Ages 8 - 18 30 to 45 minutes
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    NCTM Illuminations
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    In this math game, learners play a one-pile game between two players. In this game, the maximum number of tokens that can be removed on each turn remains constant throughout the game. Learners...

    1 cent - $1 per group Ages 14 - 18 1 to 2 hours