“Mention the fact that you’re finding it harder and harder to concentrate lately. The complaint appears to be universal, yet everyone blames it on some personal factor: having a baby, starting a new job, turning 50, having to use a Blackberry for work, getting on Facebook, and so on. … Winifred Gallagher’s new book, ‘Rapt: Attention and the Focused Life’ argues that it’s high time we take more deliberate control of this stuff.”