Binary is another name for base-2 numbering. The everyday numbers we’re used to counting with are base-10, meaning there are 10 basic numbers – 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 – from which all others are constructed. For example, 625 means there are 6 hundreds (10x10), 2 tens (10s) and 5 units. In binary there are just 2 basic numbers, 0 and 1. The number 6 would be written 110 – 1 four (2x2) plus 1 two (2s) plus zero units. In 2008, British man Ben Pridmore set the world record for memorising the most binary digits in five minutes – accurately reciting every digit from a randomly generated sequence 930 digits long. Pridmore set his impressive record at the 2008 UK Memory Championships in London, of which he was also the overall winner.