An experimental blood test could detect a devastating disease almost two decades before a typical diagnosis. A new report has found that this test could predict Alzheimer’s disease 17 years earlier than usual. The findings, published in the Journal of Physical Chemistry B , also suggest that this test could detect Parkinson’s disease early. As reported by Study Finds , this report focused on the use of a new sensor called the immuno-infrared sensor (iRS). This sensor can detect abnormal protein