India, Jan. 27 -- Geneva (dpa) - Regular reading, having a command of more than one language, remaining fit or at least physically active, healthy eating, and sleeping well earlier in life have all been linked in recent years to preventing dementia or at least delaying its onset among those whose family history implies susceptibility. According to researchers at Tilburg University in the Netherlands, the University of Geneva and Sweden's Karolinska Institutet, regular babysitting by granny and grandad is likely another potential bulwark against the effects of ageing. "Grandparents who provide care for their grandchildren tend to show better cognitive functioning than those who do not," the team said in a paper published inPsychology and Agi...