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    APSnet
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    This exercise can be used to stimulate the investigative nature of learners as they use forensic plant pathology techniques to prove the learners' innocence in a mock murder investigation....

    1 cent - $1 per group Ages 11 - 18 45 to 60 minutes
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    IEEE
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    In this activity, learners investigate Scanning Probe Microscopes (SPM) and then work in teams using a pencil to explore and identify the shape of objects they cannot see, just as SPMs do at the...

    $1 - $5 per group Ages 8 - 14 1 to 2 hours