Scientists have developed a promising—and simple—blood test for accurately diagnosing Alzheimer’s, something doctors have long wanted. What’s more, the test can detect changes in the brain 20 years before outward symptoms appear. While the test probably won’t be available for a few more years, this research represents a real step forward in the fight against Alzheimer’s. As one scientist noted, “you can’t treat the disease without being able to diagnose it. And accurate, low-cost diagnosis is really exciting.”

The New York Times explains it all in: “‘Amazing, Isn’t It?’ Long-Sought Blood Test for Alzheimer’s in Reach”