The Poincaré Conjecture?

On November 11, 2002, Grigoriĭ Yakovlevich Perelman, a geometer working in the St. Petersburg section of the Steklov Mathematical Institute at Fontanka 27, published on the internet a forty-page paper titled “An Entropy Formula for the Ricci Flow and Its Geometric Applications.” The fourth page of the dry introduction, full of technical terms, ends with the sentence: Finally, in Section 13, we give a brief sketch of a proof of the Geometrization Conjecture.