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    Lawrence Hall of Science
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    These puzzles use four colors of socks in a drawer to get learners thinking algebraically. The introduction suggests that actual socks should add fun to the activity, and colored markers can help...

    1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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    Bill Nye
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    In this activity, learners discover how sweating makes us feel cooler. Learners put on one damp sock and one dry sock and sit in front of a fan. As the water in the damp sock evaporates, it makes...

    free Ages 4 - 14 5 to 10 minutes