You are what you bleed: In Japan and other east Asian countries some believe blood type dictates personality By Rachel Nuwer | Feb 15, 2011 10:40 AM | 1 Share Email Print "The Japanese have found a new way to ‘typecast’ people. It’s not astrology; it’s not studying the bumps on people’s heads. It’s blood typing. There is absolutely no scientific basis for typecasting by blood, of course, but that