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Will it Bounce? |
$225.00 |
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Why are Molecules Attracted to Each Other? |
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How do Electric Motors Work? |
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$225.00 |
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Can we Design New Machines? |
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$225.00 |
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What are the Properties of Magnets? |
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$225.00 |
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What is Reflection and Refraction? |
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$225.00 |
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