“The drug has proved highly effective at reducing the plaques, called beta amyloid, that build up in the brains of people with Alzheimer’s. But does the drug actually slow the progression of the disease when it reduces the plaques? It’s not yet clear.” The FDA Has Approved A New Alzheimer’s Drug. (But there’s still a lot of debate about its effectiveness.)

+ “Beyond the status of this particular drug, some experts worry approval could lower standards for future drugs — an especially important question at a time when public trust in science is teetering.” NYT with the backstory: Alzheimer’s Drug Poses a Dilemma for the F.D.A.