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Things that are different sizes and stiffness vibrate differently, and in this Exploratorium Science Snack, you'll see how rings of various diameters react to vibration and external forces.

1 cent - $1 per student Ages 8 - 18 5 to 10 minutes
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In this activity, learners work in teams to investigate the composition of unseen materials using a variety of tools.

Over $20 per group Ages 8 - 14 30 to 45 minutes