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Latest comment: 29 days ago1 comment1 person in discussion
Looked up this unfamiliar term and got stuck on this definition: "a fracture with smooth, curved surfaces, typically slightly concave, showing concentric undulations resembling the lines of growth of a shell"
What struck me is, if it's a fracture, resulting in two pieces, then both surfaces can't be slightly concave. The concavity of one piece should be matched exactly by the corresponding convexity of the other.
