With so many things now demanding our attention -- emails, Web sites, BlackBerry alerts, incoming text messages, Twitter tweets, Facebook updates, blogs, stock updates, and old-fashioned meetings and phone calls -- increasing numbers of us multitaskers are plagued by bad habits and technology overload, darting from one mental activity to the next. In her new book "Rapt", Winifred Gallagher concentrates on what science has to tell us about the mind's capacities for paying attention and points to our need for sustained focus.
