Last year, the National Institute on Aging (NIA) announced an ambitious, $300 million–plus project to gather “real-world” data on people who have Alzheimer’s disease or might develop it by drawing on medical records, insurance claims, mobile devices, wearable sensors, and more. The proposed database would aim to “transform” research into Alzheimer’s and related diseases, according to an NIA funding opportunity notice. It would be “truly exciting and a very important step forward for our field,” ...