ANSWERS: 9
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A hole?
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Holes
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helium
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You are supposed to also say the box is full, there is no room to put anything more in. Anyway, as people have said - The answer is a HOLE... or lots of holes :)
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A lantern.
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Helium if it is somewhat air-tight.
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Put a fire in the box.
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holes.
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If you're referring to "mass", you can not put anything in to make it lighter. What will go in will only make it heavier. Simply answer: there is no such thing that will make you wooden box lighter without spme extreme manipulation in quantum physics which humans have no ideas on but still think we are the best and have the right to eat meatfrom another poor soul!
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