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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: Et_tu,_Brute, Deaths_in_2007, Barack_Obama, Live365, The_Age, Lloyd_Blankfein, Gita_Sahgal, Nobel_Prize, Hillary_Rodham_Clinton, E-Science, Boyce–Codd_normal_form, Harry_Potter, NLP, Compact_disc, 2007, 2005, Guadiana, Gary_Brecher, Wikipedia:Administrator_intervention_against_vandalism, Richard_Buckley.
Plots being processed: Godspeed_You!_Black_Emperor, Tour_de_France, enterprise_resource_planning, Rick_Astley, steve_fossett.