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    National Postal Museum
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    In this online activity, learners crack the special code imprinted on envelopes to help the U.S. Postal Service deliver the mail. Hints within the activity help learners understand how the code...

    free Ages 8 - 14 5 to 10 minutes
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    American Association for the Advancement of Science
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    Whether it's the genetic code, an ancient language, or patterns of light in a distant galaxy, scientists often have to play the role of decoder. In this activity, learners create a code to...

    1 cent - $1 per group Ages 8 - 11 10 to 30 minutes
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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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    Oregon Museum of Science and Industry
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    In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other. They can also create their own codes that are different from...

    1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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    WGBH
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    In this activity, learners use mirrors to write secret messages to a friend. Use this activity to explore letters, optics, and/or symmetry.

    1 cent - $1 per student Ages 6 - 11 5 to 10 minutes
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    American Museum of Natural History
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    In this activity, learners work in partners to create and exchange messages written in Braille. Learners use a Braille key and thumbtacks to write their messages in Braille. This activity will...

    free Ages 8 - 14 10 to 30 minutes
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    Museum of Science and Industry, Chicago
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    Learners write a message in Braille using beans to form the patterns of dots. Learners glue beans in place, and then challenge another learner to read the message. This resource includes a Braille...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    NCTM Illuminations
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    This math lesson provides an introduction to the use of variables, and develops learners' algebraic thinking. Learners create "variable machines" out of paper to discover the "...

    1 cent - $1 per student Ages 8 - 11 45 to 60 minutes
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    Lawrence Hall of Science
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    In this outdoor, night-time activity, learners discover how to spot eye-shine (reflection of light from an animal's eyes) by using a flashlight to play a simulation game. Using the spotting...

    $10 - $20 per group Ages 8 - 18 1 to 2 hours
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    American Society for Microbiology
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    Learners construct an RNA Decoder Ring then use it to translate an RNA sequence into its corresponding amino acid sequence. This resource includes four different translating activities. In one...

    1 cent - $1 per student Ages 11 - 18 45 to 60 minutes

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