my idea to float a ping pong ball was to create a hole in a cup and use the compressed air to float the ball above the cup's rim

My idea to float a ping pong ball was to create a hole in a cup and use the compressed air to float the ball above the cup's rim. To my surprise it worked first time, the key was to have someone drop the ping pong ball from an elevated position, that seemed to cause the ball to float instead of being shot off into a lower earth orbit.

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