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In Japan, you are what your blood type is. A person’s blood type is popularly believed to decide his/her character and personality. Type-A people are generally considered sensitive perfectionists and good team players, but over-anxious. Type Os are curious and generous but stubborn. Type ABs are artistic but mysterious and unpredictable, and type Bs are cheerful but eccentric, individualistic, and selfish. Though lacking scientific evidence, this belief is widely seen in books, magazines, and television shows. Last year, four of Japan’s top 10 bestsellers were about how blood type determines personality, through which readers seemed to be able to discover the definition of their blood type or have their self-image confirmed.

The blood-type belief has been used in unusual ways. The women softball team that won gold for Japan at the Beijing Olympics is reported to have used blood-type theories to customize training for each player. Some kindergartens have adopted teaching methods along blood group lines, and even major companies reportedly make decisions about assignments based on an employee’s blood type. In 1990, Mitsubishi Electronics was reported to have announced the formation of a team composed entirely of AB workers, thanks to “their ability to make plans”.

The belief even affects politics. One former prime minister considered it important enough to reveal in his official profile that he was a type A, while his opposition rival was type B. In 2011, a minister, Ryu Matsumoto, was forced to resign after only a week in office, when a bad-tempered encounter with local officials was televised. In his resignation speech, he blamed his failings on the fact that he was blood type B.

The blood-type craze, considered simply harmless fun by some Japanese, may reveal itself as prejudice and discrimination. In fact, this seems so common that the Japanese now have a term for it: bura-hara, meaning blood-type harassment (骚扰). There are reports of discrimination leading to children being bullied, ending of happy relationships, and loss of job opportunities due to blood type.