Dementia: The greatest health challenge of our time Dementia is the greatest health challenge of our time, the charity Alzheimer's Research UK has warned.
Dementia was first described by the German doctor Alois Alzheimer in 1906 after he performed an autopsy on a woman with profound memory loss.
What he found was a dramatically shrunken brain and abnormalities in and around nerve cells.
At the time dementia was rare and was then barely studied for decades.
But today somebody is diagnosed with it every three seconds, it is the biggest killer in some wealthier countries and is completely untreatable. BBC News
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