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    New York Hall of Science
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    See and hear how sound waves travel through different types of materials. Extend the experiment online and learn how you can "see" with sound waves using ultrasound.

    1 cent - $1 per student Ages 6 - 11 5 to 10 minutes
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    Twin Cities Public Television
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    In this activity, learners compare ways to measure their heart rates. Learners build their own stethoscopes and learn how exercise affects heart rate.

    $5 - $10 per group Ages 8 - 14 1 to 2 hours
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    NSBRI
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    In this activity (page 105 of the PDF), learners measure heart rate and blood pressure and learn how to obtain consistent measurements during repeated tests. This activity teaches learners how to...

    1 cent - $1 per group Ages 8 - 18 10 to 30 minutes
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    NSBRI
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    In this activity about how the body regulates blood pressure (page 117 of the PDF), learners make and compare measurements of heart rate and blood pressure from three body positions: sitting,...

    1 cent - $1 per group Ages 8 - 18 30 to 45 minutes