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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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    Oregon Museum of Science and Industry
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    Make a copy of the first stethoscope with only a cardboard tube! René Laennec invented the first stethoscope in 1819 using an actual paper tube! Since then, the design has evolved into what we use...

    free Ages 4 - 14 5 to 10 minutes