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    The Exploratorium
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    Listen to the beat of gravity. By taking two strings with weights tied to them at different, yet uniform intervals, you can hear the uniformity (and rhythm) of gravity's accelerating pull.

    1 cent - $1 per student Ages 6 - 14 Under 5 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