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With two test tubes you have a spare in case one of the breaks.
TESCO
For the same amount of metal, hollow tubes are much stronger than solid tubes.
yes
Xylem and Phloem
yes, and vac tubes are the most efficient
Modern devices use integrated circuits instead of vacuum tubes because integrated circuits occupy less space than vacuum tubes, are more efficient, consumes less energy and are more reliable than vacuum tubes.
Tubes in the steam.
Lava tubes are usually produces by pahoehoe.
The vascular tissue called the phloem.
First lower the bridge to the lowest it can go (0meters). Then make sure you use all carbon steel. Try and use hollow tubes instead of solid steel. If possible check and see if you can use strong hollow tubes instead of weak solid steal... (ex. use 200mX200m hollow tubes instead of 100mX100m solid tubes) This is sometimes cheaper, not always though. Also once you have your bridge built and it works, look for simple ways to lower the cost, like lowering the strength of some steel beams or hollow tubes.
pixie sticks??