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xkcd #3097: Bridge Types
(imgs.xkcd.com)
Title text:
Pontoon bridges are just linear open-sided waterbeds.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3097/
The elevator thing is actually real: https://www.youtube.com/watch?v=A2g4u9F9i90
I recognized the structure in the thumbnail. I clicked the link just to make sure it was the Tom Scott video. Cheers dude.
So sad he stopped doing his regular videos. (Though I totally understand his reasoning.)