Nov. 9 (UPI) -- U.S. scientists have discovered a new tool that may help physicians diagnose Alzheimer's disease earlier -- and with a simple blood test -- once a person develops mild cognitive impairment and before significant neurological damage occurs. The study's findings were published Wednesday in the journal ACS Chemical Neuroscience. The progressive illness, which begins with mild memory loss, may lead to inability to carry on conversations and respond to elements in their environment. "One practical application we can envision is [a] blood-based diagnostic test for checking early signs of Alzheimer's disease," Bin Xu, the study's principal investigator...