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An open question is how big Wiki pedia should become. How many ideas are worthy of an article? Per haps all of the notable subjects have already been covered, and the number of new contributors should be kept small. Wales has argued in recent years that the challenge to Wikipedia going forward is to shift the focus from volume to quality of content. Here we examine the size of Wiki pedia and how it has evolved over the years. A future column will explore the issue of quality.