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Model Eardrum
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In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.

The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.

Column Chromatography
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In this activity, learners separate the components of Gatorade using a home-made affinity column.