Just as increasing evidence seems to show staying active can prolong your life comes a new study that suggests chilling out could have the same effect. Scientists at Harvard have found that people who live longest have lower levels of neural activity – anything from tapping your feet to puzzling over a crossword – compared with those who die younger. They studied brain tissue from cognitively healthy people between the ages of 60 and 100 and found those who lived longest had triggered fewer genes related to brain excitement. Those who lived to 100 had significantly higher levels of a protein called REST in their brain cells.