In this June 1, 2017, photo, Metin Eren, an archaeologist at Kent State University, looks at a newly chipped flake of obsidian in Kent, Ohio. Eren runs a newly-opened laboratory which makes replicas ...
From The New York Times: "For hundreds of years, the best violin players have almost unanimously said they prefer a Stradivari or a Guarneri instrument. Why nobody has been able to replicate that ...
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