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WikiChanges is a web-based tool that exposes the revision history of Wikipedia articles using an interactive graphical timeline. See About for more information and a Greasemonkey script to embed timelines in the real Wikipedia.
Last 20 plots: Barack_Obama, Barack_Obama_assassination_plot_in_Denver, Standing_Rules_of_the_United_States_Senate, World_citizen, Guta, Tour_de_France, Pedro_Santana_Lopes, Rick_Astley, Heart_Sutra, Hacker_ethic, Star_Wars, Jean_Monnet, 2004_Indian_Ocean_earthquake_and_tsunami, by, Super_Bowl, Hillary_Rodham_Clinton, Zine_El_Abidine_Ben_Ali, Colon_classification, Genghis_Khan, Social_network_analysis.
Plots being processed: Godspeed_You!_Black_Emperor, Tour_de_France, enterprise_resource_planning, Rick_Astley, steve_fossett.