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    Lawrence Hall of Science
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    In this self-measuring activity, learners observe and record how many times a minute they blink, take a breath, and chew, as well as how many times a minute their heart beats. Learners are...

    1 cent - $1 per group Ages 4 - 14 30 to 45 minutes
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    Lawrence Hall of Science
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    In this activity and/or field trip, learners investigate the water currents that aquatic animals create when they breathe, feed, and propel themselves through water. Learners trace the currents in...

    $10 - $20 per group Ages 8 - 18 30 to 45 minutes
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    Twin Cities Public Television
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    In this activity, learners explore the structure of plant leaves. Learners find out what happens when they coat either the top or bottom sides of leaves with petroleum jelly. Use this activity to...

    $5 - $10 per group Ages 6 - 14 1 to 7 days