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Kindergarten
If a balloon is filled with helium, it will cause the balloon to float in the air. Helium is a type of gas, invisible to the human eye, that is lighter than air, which causes it to float upwards.
If a balloon is filled with helium, it will cause the balloon to float in the air. Helium is a type of gas, invisible to the human eye, that is lighter than air, which causes it to float upwards.
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