Munetaka Haida (Tokai University School of Medicine) suggests the possibility that activated parts of the human brain are different according to blood types. i.e. type A's left brain is superior to the right, while type B's right brain is superior. Popularity In Japan, discussion of blood types is widely popular in women's magazines as a way of gauging relationship compatibility with a potential or current partner. Morning television shows feature blood type horoscopes, and similar horoscopes are published daily in newspapers. The blood types of celebrities are listed in their infoboxes on Japanese Wikipedia. A series of four books that describe people's character by blood type ranked third, fourth, fifth, and ninth on a list of best-selling books in Japan in 2008 compiled by Tohan Corporation. No less than two-thirds of people in several East Asian countries and areas, such as Japan, Korea, and Taiwan, believe in the association between blood types and personality. Furthermore, according to one Japanese survey, more than half of Japanese people are fond of talking about blood type and personality. The research also says that people in Japan like blood-typical personality diagnosis and 1. talk about it with proper knowledge, 2. believe some relationships exist between blood type and personality, 3. feel its traits apply to themselves to a certain degree. The results of the two other surveys are the same. Although there is no proven correlation between blood type and personality, it remains popular with the many matchmaking services that cater to blood type. In this way, it is similar to the use of astrological signs, which are also popular in Japan. Asking one's blood type is common in Japan, and people are often surprised when a non-Japanese does not know their blood type. It is common among anime and manga authors to mention their characters' blood types and to give their characters blood types to match their personalities. Some video game characters have known blood types. Also, it is common for video game series to allow for blood type as an option in their creation modes. After then-Reconstruction Minister Ryu Matsumoto's abrasive comments towards the governors of Iwate and Miyagi forced him to step down from his post, he partially blamed his behavior on his blood type, saying "My blood is type B, which means I can be irritable and impetuous, and my intentions don't always come across." Blood types are important in