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- Mon Feb 18, 2013 11:07 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1175:"Moving Sidewalks"
- Replies: 78
- Views: 21745
Why not a river of quicksilver, of variable depth (1 foot to 10 feet deep) and constant width and people ride in boats with dragfins so they stay at stream speed and do not over-run, and with collapsible rolls of material connecting the ends to allow for speed changes and with the mercury surface co...