Blood from young mice improved learning and memory in older mice, and increased connections between their brain cells.
It is rumoured that the late Kim Jong-il would inject himself with blood from healthy young virgins in a bid to slow the ageing process. Remarkably, the North Korean dictator might have been onto something. Experiments on mice have shown that it is possible to rejuvenate the brains of old animals by injecting them with blood from the young.
Saul Villeda of Stanford University, who led the work, found that blood from young mice reversed some of the effects of ageing in the older mice, improving learning and memory to a level comparable with much younger animals. He said that the technique could one day help people stave off the worst effects of ageing, including conditions such as Alzheimer's.