for science today we had a super interesting one. It's about the hot air balloon. This person a while ago like a long time ago he had this idea about this ballon. it was like this thin balloon-shaped thing that was filled with some gas that is lighter than air. A lot of people tried on these experiments but these two brothers. they figured out that hot air is lighter than cold air so. Simply make a ballon of a light substance and light a fire under it. It's genius almost they put animals in this basket to find out how high they could go with air enough. and it worked.

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