9th February 2008, 6:58 PM
As to this blood type prediction thing, if I know my pseudoscience, I'd guess their "up to date" explanation of "how it works" probably involves DNA and this being a "common sign" for how their DNA wired them up. In a sense it makes it a LOT more reasonable than astrology as that's something that's at least feasible. It still falls apart for the same reasons as the basic tabloid "star sign" style of astrology, in grouping every single individual and personality type into such a ridiculously small number. Of course the total lack of evidence is still key reason to doubt it. Further, those who actually know the coding of how genes and alleles interact will be able to accurately say if the code responsible for blood type is read by personality determining code and thus affected by it.
"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." ~ Charles Babbage (1791-1871)