Two whirlwinds blew into Buenos Aires this week: the hundreds of Wikipedia supporters, editors and administrators here for their annual Wikimania conference, and the free-software activist Richard Stallman, who was in town as part of his never-ending tour of the globe to promote his cause. The two are set to meet Wednesday, when Mr. Stallman gives the keynote address at Wikimania in a theater across the street large enough to accommodate the expected crowd. But they don’t exactly blow in the same direction.
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