Leonardo DiCaprio is to play a man with a particular gift for reading body language in the forthcoming adaptation of Blink, Malcolm Gladwell’s bestseller about how people make snap decisions. The writer-director will be Stephen Gaghan, who won an Oscar for his screenplay of 2000’s drug trade film Traffic. "[Gaghan] came to me out of the blue," Gladwell told trade magazine Variety. ‘He thought there was something in the book that was a movie. We took one chapter from the book and fashioned a story out of it. But most of it is something we dreamt up together."