In mathematics, the Poincaré conjecture (see Henri Poincaré for pronunciation) is a conjecture about the characterisation of the three-dimensional sphere amongst 3-manifolds. Until its recent resolution, it was widely considered to be the most important unsolved problem in topology. It is one of the seven Millennium Prize Problems for which the Clay Mathematics Institute is offering a $1,000,000 prize for a correct solution.
As of 2006, a consensus amongst experts has concluded that recent work by Grigori Perelman in 2003 has disposed of this question, after nearly a century. And now it has been solved by two mathematicians from China who just spent two years to make the job done.
中國數學雙傑 破解百年難題 / 綜合報道 / 5Jun06
http://hk.news.yahoo.com/060604/60/1og72.html
References: http://en.wikipedia.org/wiki/Poincare_conjecture
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