Computing with counters. How "counter machines" are as powerful as turing machines, albeit slightly more convoluted! Dr Christopher Hampson, Senior Lecturer in Computer Science Education at KCL explains. EXTRA BITS: https://www.youtube.com/watch?v=ydmV-mWjftc 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/