Webhead goldfish

Frequent web users end up with an online attention span of about nine seconds - the same as that of a goldfish. The impulse to move on to the next choice means we lose the ability to concentrate, Ted Selker of the MIT told the BBC. The answer, Selker argues, is to give yourself goals and not to "be pushed around by the most exciting words in a never ending sea of information."
(From BBC Sci/Tech)