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Falling Rhythm
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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.
The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.
From the Ground Up
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In this plant science activity, learners conduct four experiments to observe how plants respond to sunlight and gravity.