Overview: There is surprising strength in a tube because it is hollow. We see how tubes are used in bicycles, organs, and roofs.
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First Air Date: Jan 14, 1980Last Air date: Nov 18, 1988Season: 7 SeasonEpisode: 223 EpisodeRuntime: 30 minutesQuality: HDIMDb: 6.50 / 10 by 4 usersPopularity: 13.791Language: English