Is brain training really the best way to boost your IQ? - The Guardian 30th April 2008

According to her TV advert, after playing Brain Training on the Nintendo DS, Nicole Kidman, 39, has a brain age to match her strangely smooth-skinned face age: 24. The game on the handheld console, which includes memory and reaction time tests, was developed by the Japanese neuroscientist Ryuta Kawashima and has sold 10m copies worldwide, spawning a craze for "brain training" that the New York Times estimated was worth more than £40m in the US alone last year.

Link to Article