At the heart of Bzip2 is the Burrows Wheeler Transform. Dr Steve Bagley (and a live studio audience) explains how & why it works. #compression #ComputerScience https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/