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What is the Science of Sound? |
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What is the Science of Surface Tension? |
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$225.00 |
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What is the Life Cycle of a Frog? |
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$175.00 |
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What are Solutions? |
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What is a Lens? |
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What happens when we Combine Simple Machines? |
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How do Shapes of Lenses affect an Image? |
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$225.00 |
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What is the Nervous System? |
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$225.00 |
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