Alzheimer’s disease is a frightening illness, partly because it seems to erase a lifetime’s learning and memories. But also because of its inexorable downward spiral. Once the process begins, it seems, it’s only a matter of time before all the things that make us human begin to fall away, one by one, until we can no longer function. Researchers would like to learn how to reverse that process. But is it possible? Researchers at MIT now say they’ve done it. The research is in mice—and it’s a big step from mice to treating people. But the research has already provided intriguing clues about how the progression of Alzheimer’s disease might at least be slowed down in its victims right now. Hosted by Paul Raeburn.