The Mathematical Bridge
This is the Mathematical Bridge over the River Cam in Cambridge. It is special because when it was built, no nails, screws, bolts or fittings were used to hold it together. Clever, eh?
A little bit less clever were the folk who took the bridge down to see how it was put together and after marvelling at the olden technology discovered they couldn’t put it together without a liberal helping of bolts.
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