The basic design--a long piece of metal, with a serrated blade, attached to a handle--didn't change much for several millennia.

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Police scientists argued that a knife found at Sollecito's home had traces of Kercher's DNA on the blade and Knox's DNA on the handle.

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He still occasionally blacksmiths in a little tin shed on the Patagonia campus, and he showed me his latest project, a metal mussel knife that he's been beating into perfect shape sharp at the blade to pry open the shells, blunt at the handle to knock away the barnacles.

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Events with the sabre, which has a dual edge and a curved guard on the handle, are the only ones where a fencer can score with the edge of the blade, not just the point.

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