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Noisy/Quiet: Range of Vibration (1x5)

Ημερομηνία προβολής: Ιαν 18, 1980

Lisa, Marc, and Trini are given a puzzle. They hear a bell ring and, as instructed, put the bell in a closed jar and take out some of the air with a vacuum pump. Since they don't hear the ringing, they begin to wonder: Is the bell broken?