Born on a blue day

27-year-old British autistic savant Daniel Tammet's ability to think abstractly, deviate from routine, and empathize, interact and communicate with others is impaired, yet he's capable of incredible feats of memorization and mental calculation. Here, Tammet traces his life from a frustrating, withdrawn childhood and adolescence to his adult achievements, which include teaching in Lithuania, achieving financial independence with an educational Web site and sustaining a long-term romantic relationship.