Critical Mass: How One Thing Leads to Another, by Phillip Ball has won the 2005 Aventis Prize for Science Books, which was presented at a ceremony at the Royal Society in London, UK. Critical Mass considers the use of statistics in the attempt to discover new insights into group behaviour and the functioning of society. I must admit, I haven't read Critical Mass, although I did enjoy the winner from 2004, A Short History of Nearly Everything by Bill Bryson.