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Extreme Sounds

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This activity (on page 2 of the PDF under SciGirls Activity: Extreme Sounds) is a full inquiry investigation into sound.
Over $20 per group Ages 8 - 14 2 to 4 hours

Mystery Jars: Make Your Own: Estimating and Counting

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Learners make a counting/estimating jar to exchange with friends or bring home.
1 cent - $1 per student Ages 4 - 14 10 to 30 minutes