Scientists have stumbled on a world first in helping a man improve his memory.
They were experimenting with deep-brain stimulation in an attempt to curb the appetite of a 30st patient who suffered from a lifelong obesity problem.
Electrodes were pushed into his brain and stimulated with an electric current.
The treatment did not cure his eating problem - but he experienced vivid memories of an event that occurred 30 years earlier.
In the following weeks, and up to a year later, the memory of the 50-year-old patient improved.