Of all the tragic things that come with Alzheimers disease, its tendency to sneak up on people is one of the toughest to deal with. Thats because by the time the condition is even detectable, theres a good chance its already too late to turn back the tide. Earlier diagnoses could mean the difference between years of mental decline and a life of relative normalcy — thats why a test developed by researchers at Kings College London and Oxford University could be such a game changer.