for science fair project

Hi, im in 8th grade currently attending st pats of heather downs in ohio and i would like to know excactly how dave williams does this. I would really like to know becasue i need to do this experiment for a science fair project. Please if u could tell me what kind of tube he used and everything. Sincerely chris

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Please solve the math problem above and type in the result. e.g. for 1+1, type 2.
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