After more than a decade of failed drug trials and $billions lost in research to try and bring an Alzheimer's drug to market, maybe the pharmaceutical industry is finally ready to admit that they don't really understand what causes Alzheimer's disease. It was announced earlier this week that Roche had failed for the second time to develop a successful Alzheimer's drug. I have been reporting on the failure of Big Pharma to produce an Alzheimer's drug for over a decade now, along with publishin...