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What are Levers and Wheels? |
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$225.00 |
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How Does the Earth Move to Make the Changing of the Seasons? |
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$225.00 |
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What is the Science of Telescopes? |
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$225.00 |
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What Lives in a Pond? |
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$225.00 |
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What is Our Solar System? |
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$225.00 |
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