The idea that blood type defines our personality, temperament and ability to mingle is routinely dismissed as nonsense, but that has not stopped four books on the subject from occupying Japan's top 10 bestseller list for the past year.
Type A Reserved and prone to worry, sensitive perfectionists such as Britney Spears and Adolf Hitler.
Type O Decisive, self-confident, curious, and ideal for sport, including Elvis Presley and the Queen.
Type B Cheerful caring, flamboyant free-thinkers such as Jack Nicholson.
Type AB High-maintenance, distant, suited to arts, such as Mao Zedong.
i'm O+