Double it and Dabble where required - The neat trick that turns pure binary into binary coded decimal. Professor Brailsford performs the magic! The Professor's Notes: C.B. Falconer's Notes: 42 & Binary Coded Decimal: EXTRA BITS: This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: Computerphile is a sister project to Brady Haran's Numberphile. More at