Reference request: Article from The Economist In a 2012 article in _The Economist_ entitled "The half-life of facts", mathematician Samuel Arbesman states that "two high-school students figured out a new way to prove one of Euclid's theorems, something that had not been done in a thousand years." What theorem is he referring to? Who are these students? Is there a publication?

According to this article in the New York Times, it's Euclid Book VI, Proposition 10, and the article is

> "Euclid, Fibonacci, Sketchpad", Litchfield, Daniel C.; Goldenheim, David A. _Mathematics Teacher_ , v90 n1 p8-12 Jan 1997

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It was reprinted in _Math Horizons_ , <