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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: Visigoths, Summer_Olympic_Games, Digital_humanities, Bharattherium, Rube_Goldberg_machine, retrieval, Pacu, Commemoration_of_Nelson_Mandela, Tour_de_France, zoom, Blackberry, Rolls-Royce_Motor_Cars, Julian_Assange, Barack_Obama, Deaths_in_2006, Deaths_in_2007, lack-of-fit_test, Napoleon_Crossing_the_Alps, Windows_Virtual_PC, Syrian_Civil_War.
Plots being processed: Marcelo_Rebelo_de_Sousa, Gender_mainstreaming, Wikipedia:Administrator_intervention_against_vandalism, 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.