She popped a little CO2 (carbon dioxide) container open.
It was in this spinner tube , and when she pops it open the force of the gas exiting the container makes the spinner tube spin really fast and for a long time. Also her hands are cold because the CO2 is very cold. This demonstrated Newtons 3rd law b/c every action has an equal and opposite reaction, interction pair forces, etc, BLAH BLAH BLAH!!!
ENJOY.
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