History can be a very useful tool in understanding why we and those we must deal with think and react in certain ways. But in the wrong hands it can be dangerous and used to foster a sense of grievance or a desire for revenge. Eminent historian Margaret MacMillan is fascinated by the power of history in our thinking. In The Uses and Abuses of History, she points out some of the traps that we can fall into when assessing the present in light of the past.