the.com/tube
a shape so simple it carries your blood, your toothpaste, and your trains underground
means A hollow cylinder used to carry or contain something, from pipes and toothpaste packaging to the cylindrical structures of bodies and machines.
from From Latin 'tubus,' a pipe or tube, which arrived in English via French in the 17th century. The British underground railway earned the nickname 'the Tube' for the tunnel-shaped tubes its trains run through, while 'the tube' as slang for television comes from the cathode-ray tube once glowing inside every set.
london nicknamethe world's first underground railway, opened 1863
vacuum originsearly computers ran on glowing glass tubes
hollow strengthtubes resist bending better than solid rods of equal weight
inner tubeonce kept tires inflated, now floats lazy rivers
youtube echothe name nods to old slang for television