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[request] according to the author this bridge fell in to the river Dard of France around 100 years ago and got covered in calcite. How long did it take?

2420 upvotes • r/theydidthemath

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[request] according to the author this bridge fell in to the river Dard of France around 100 years ago and got covered in calcite. How long did it take?	2420	theydidthemath