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  • What is buoyancy?
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  • How do seaplanes float?
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  • How do I know if I have positive or neutral buoyancy?
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  • How do submarines float and dive?
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  • How do ships float if they are so heavy?
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  • What is a torpedo and how do they sink ships when they hit them?
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  • When we are underwater, the gravity pulls us down but our hair still stands up. Why?
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  • What is a barge christening ceremony?
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  • Why do people build ships?
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