Mental And Physical Exercise Delays Dementia In Fatal Genetic Disease

Another example of the interaction between nature and nurture.
Huntington's disease is what killed Woodie Guthrie.

http://www.sciencedaily.com/releases/2008/01/080124092540.htm

ScienceDaily (Jan. 29, 2008) — Scientists at Melbourne's Howard Florey Institute have discovered that mental and physical stimulation delays the onset of dementia in the fatal genetic disease, Huntington's disease.