Walter Alvarez: Discoverer of astreroid that killed the dinosaurs at Microsoft Faculty Summit

Walter Alvarez teaches geology at Berkley and his main contribution to the history of science is the theory that the

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Preece and Shneiderman about the pattern of collboration online using Wikipedia as a testing ground

This piece, which is available online, has become an instant classic… Billions of people participate in online social activities. Most

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