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    Oregon Museum of Science and Industry
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    In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back. They turn over two tiles at a time, and try to remember past tiles so they can find...

    1 cent - $1 per group Ages 4 - 11 45 to 60 minutes
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    Oregon Museum of Science and Industry
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    Learners create an Incan counting device called a quipu (pronounced kee-poo). Similar to an abacus, a quipu is a series of strings tied together, with a complex set of knots tied in each string to...

    1 cent - $1 per student Ages 6 - 14 10 to 30 minutes