What if...
 Fred |
 Lilly |
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The wooden chunk is affected by a greater buoyancy both in water and in air than the iron chunk.
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Right. But if the air is extracted from the glass globe, the two bodies are not surrounded by any substance anymore...
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... and therefore there is not any buoyancy anymore!
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I think, that this insight could be useful for solving the brain-teaser.
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You surely have an idea, too, don't you?
