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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

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In this math activity related to light, learners assemble a photometer and use it to estimate the power output of the Sun.

1 cent - $1 per student Ages 14 - 18 10 to 30 minutes