Hamilton's talk was aimed at experts and was very interesting for experts. He gave his stamp of approval to the Perelman proof of the Poincare conjecture, and explained how to effect some parts of the proof more simply than had Pereleman. He explained the overall strategy of proof, the principal difficulties, and what he regarded as Perelman's principal contributions （e.g. the noncollapsing theorme）. It was also an opportunity for Hamilton to glory in the occurrence that Perelman has completed a program which Hamilton had proposed and to which Hamilton has dedicated almost 30 years of hard work; it was ok that Hamilton talked too long. The projector problems etc. are a bit embarassing, but it was more embarassing that most of the lauders had failed to practice speaking for only 20 minutes. But then what is the worth of a 20 minute talk anyway . . .
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