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    The Exploratorium
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    In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern. With...

    $5 - $10 per group Ages 11 - 18 1 to 2 hours
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    American Association for the Advancement of Science
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    In this online game, learners test their skills of categorization. Sixteen different organisms are given (human, monkey, jellyfish, etc.) and one category (e.g., things that eat fish, birds, things...

    free Ages 8 - 11 10 to 30 minutes
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    Howard Hughes Medical Institute
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    In this interactive activity, learners analyze seashells to explore phylogeny and evolution. Learners identify similar and dissimilar seashells to create a phylogenetic tree. The Teacher Guide...

    free Ages 11 - 18 10 to 30 minutes
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    Lawrence Hall of Science
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    In this activity, learners explore a bucket of sand and beach objects. First they sort items using observable characteristics, then they turn hard candy into "candy sand" to model where...

    $1 - $5 per group Ages 4 - adult 10 to 30 minutes
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    Children's Museum Of Houston
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    In this card game, learners make two sets of three cards that are alike. Learners must justify to the rest of the players why the three cards belong in each set. This activity guide contains sample...

    free Ages 8 - 11 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    In this activity, learners sort and count different colored plastic dinosaurs by various attributes including tail length, whether or not the dinosaurs have horns, etc. Learners discuss the basis...

    free Ages 4 - 6 10 to 30 minutes
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    Twin Cities Public Television
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    In this activity (on page 2 of the PDF), learners will develop their own version of a tool used by biologists, a dichotomous key, by collecting all their left shoes. Learners brainstorm different...

    free Ages 8 - 14 10 to 30 minutes
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    NCTM Illuminations
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    This lesson focuses on the observation of properties and the classification of objects to build ideas about variables. Learners compare buttons to identify similarities and differences. In addition...

    $1 - $5 per group Ages 4 - 8 45 to 60 minutes
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    COSI
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    In this classification activity, learners will learn one way of organizing plants and animals. The learners will "classify" themselves by means of a dichotomous key, a tool used to...

    free Ages 8 - 11 10 to 30 minutes
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    American Association for the Advancement of Science
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    Learners practice their taxonomy skills by sorting a group of fasteners (e.g. rubber bands, buttons, paper clips, screws) into different categories. First they split the group into two groups based...

    1 cent - $1 per group Ages 8 - 11 30 to 45 minutes

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