A lot has happened in the month since BP's Deepwater Horizon oil rig exploded, sunk, and caused the worst oil spill in US history. To help keep track of the events, we've put together a handy timeline of the disaster and some of the history behind it, from BP's green rebranding effort to the Mineral and Management Service's record of lax oversight. It's a work in progress, so check back for the latest developments and more background info in the days ahead. Slide along the timeline using the scroll bar on the bottom; zoom in and out using the slider on the left side. Or view a full-screen version of the timeline here.