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    The Exploratorium
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    We listen to stereo music systems, tv's, and radios because it simulates being where the sound originates. Sound is simply arriving at one ear before the other and you instinctively know its...

    free Ages 4 - 14 Under 5 minutes
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    American Association for the Advancement of Science
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    In this online activity, learners partner up to complete several physical exercises and assess their starting fitness level. Over the course of 6 weeks, learners practice the activities and record...

    1 cent - $1 per student Ages 8 - 11 1 to 12 months