Overview: A teeter-totter is the perfect demonstration of the lever, particularly if you are trying to ride a teeter-totter with someone heavier than you. Such is the Principle of the Lever.
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First Air Date: Jan 01, 1980Last Air date: Jan 01, 1981Season: 2 SeasonEpisode: 30 EpisodeRuntime: 5 minutesQuality: HDIMDb: 0.00 / 10 by 0 usersPopularity: 1.887Language: English