Nicole D. Anderson researched the neurological science of the genetic factors of dementia or Alzheimer’s disease. The author, after describing the variety of genes and their risks, then reports on the “huge array” of lifestyle, environment, and social capital factors that modify this risk. These factors, including the physical, social and cognitive conditions, are enumerated. Social capital deficiencies also enter this picture: low social capital, low social activity, living alone and more. The author suggests that neurological research complements other social capital studies, which presents new opportunities for research.