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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
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    WNET
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    In this Cyberchase activity, learners make decoders to send and receive secret messages. Learners make the device out of two 8-ounce cups and two code strips. Then, they use it to decode Hacker&...

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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    Computer Science Unplugged
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    This activity shows learners how computers use numbers to represent pictures. A grid is used to represent the pixels (short for picture elements) of a computer screen. Numbers indicate whether...

    1 cent - $1 per student Ages 6 - adult 30 to 45 minutes