A brain scan that can apparently root out racists has been developed by scientists. The technique was used on white volunteers shown photographs of black individuals. In those with racist tendencies, a surge of activity was seen in part of the brain that controls thoughts and behaviour. Scientists believe this reflected volunteers' attempts to to curb their latent racism. After interacting with real black individuals, the same group performed poorly in a task designed to test mental resources. The American researchers concluded that harbouring racial prejudice, even unintentionally, stirred up an inner struggle that exhausted the brain. Dr Jennifer Richeson,...