AILSA CHANG, HOST:
Next up, scientists are trying a new approach to reversing memory loss. NPR's Jon Hamilton reports on a study of forgetful mice treated with a substance found in spinal fluid.
JON HAMILTON, BYLINE: Mice, like people, tend to develop memory problems as they age. Tony Wyss-Coray of Stanford University says when mice are young, they will remember a painful experience for weeks.
