Few of us will escape the impact of Alzheimer’s Disease. The grim pay-back from being healthy, wealthy or lucky enough to live into our late 80s and beyond is dementia. One in three - maybe even one in two of us - will then get dementia and forget almost everything we ever knew. But it is far more than just a personal family tragedy. We explore how fear in some parts of the world is stigmatising those who have it, and denying help to those who need it.