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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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    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