7 Tymor
223 Pennod
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.
- Blwyddyn: 1988
- Gwlad: United States of America
- Genre:
- Stiwdio: PBS
- Allweddair:
- Cyfarwyddwr:
- Cast: