7 हंगाम
223 भाग
3-2-1 Contact - Season 7 Episode 17
There is surprising strength in a tube because it is hollow. We see how tubes are used in bicycles, organs, and roofs.
- वर्ष: 1988
- देश: United States of America
- शैली:
- स्टुडिओ: PBS
- कीवर्ड:
- संचालक:
- कास्ट: