Pet Scan (IMAGE) Johns Hopkins Medicine Caption In a search for clues to what may delay or prevent Alzheimer's disease, Johns Hopkins Medicine scientists report that smarter, more educated people aren't protected from the disease, but do get a cognitive 'head start' that may keep their minds functioning better temporarily. Credit Rebecca Gottesman Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.