ANSWERS: 4
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Think of something that is small enough to fit in a bottle, will absorb enough water to expand and plug the opening, that floats on water.
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is it a spong
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A tampon.
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There are many things that could allow for such an effect. Basically anything that is heavy enough to counteract the boyancy effect of water, and is also able to provide a liquid seal. A ball of apoxy would probably do it. A very large marble would, as would a round piece of rubber. You've lots of possibilities.
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