An Alzheimer's researcher of the Research Center and Advanced Studies (CINVESTAV) shows a piece of brain before cutting at Insituto Politecnico in Mexico City April 20, 2012. Alzheimer's is a progressive, degenerative disease that robs people of memory, reasoning and the ability to communicate. About 24 million people worldwide have the disease according to the World Health Organization. In Mexico, 600,000 Mexicans out of 9 million adults over the age 60 suffer from Alzheimer's, according to the Institute of Geriatrics (INGER). Picture taken April 20, 2012. REUTERS/Edgard Garrido (MEXICO - Tags: HEALTH SOCIETY)