What is Alzheimer’s disease? – Ivan Seah Yu Jun

View full lesson: http://ed.ted.com/lessons/what-is-alzheimer-s-disease-ivan-seah-yu-jun Alzheimer's disease is the most common cause of dementia, affecting over 40 million people worldwide. And though it was discovered over a century ago, scientists are still grappling for a cure. Ivan Seah Yu Jun describes how Alzheimer's affects the brain, […]