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What is the function of Wheels, Pulleys, and Gears? |
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What is Weather? |
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$595.00 |
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What are Engineers? |
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$595.00 |
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What is Force? |
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$225.00 |
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Why is it Cold Outside? |
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$225.00 |
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What Flies Besides Airplanes? |
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$225.00 |
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What Makes You You? |
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