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Does Air Help Us Float? |
$225.00 |
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What is Bernoulli's Principle? |
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Our Earth in the Solar System |
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$695.00 |
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What Lives in a Pond? |
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$225.00 |
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What Makes up the Weather? |
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$225.00 |
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What allows Planes to Fly? |
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$225.00 |
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Are Bubbles Made of Air? |
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$225.00 |
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