Social psychology attempts to understand, explain, predict and, when needed, change people's thoughts, feelings and behaviours. For a relatively young discipline it has already made great strides toward this awe-inspiring goal. Pioneers such as Lewin, Asch, Kelley and Festinger began groundwork in the 1940s and 1950s, but it was only in the late 1960s that social psychology came of age. Since then it has blossomed, both in investigating the basics...