Blood group system as we know it was developed by Austrian scientist in 1900, and already in 1927 Takeji Furukawa, a professor at Tokyo Women’s Teacher’s School, suggested personality types and blood groups must be related. He has backed it with his own observations, and the theory quickly spread in Japan and beyond. While it wasn’t a big hit in the Western world, it is taken very seriously in Japan, South Korea and some other Asian countries. In fact, there were cases of discrimination based on blood group in workplace and schools. Japanese even have a special term for this type of discrimination – bura hara, or blood type harassment.