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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: Refusenik, Manuel_Alegre, Lois_Lane, Connectivism, you, Assassination_of_Robert_F._Kennedy, Adolph_Lewisohn, Maywand_District_murders, Kenton,_Delaware, Iran, Simcha_Bunim_Alter, Fruit, Arabidopsis_thaliana, Bob_Sproull, Dave_Chappelle, United_States_dollar, Lists_of_deaths_by_year, Ovos_Moles_de_Aveiro, List_of_real-time_operating_systems, Hacker_News.
Plots being processed: Edgar_Wind, Temporal_information_retrieval, Paulo Portas, state_of_wisconsin, narendra_modi, Godspeed_You!_Black_Emperor, Rick_Astley, Tour_de_France, enterprise_resource_planning, steve_fossett.