Providing nurse visitations to poor mothers where advice is given on reducing smoking and alcohol use cuts juvenile delinquency in half 15 years later.

CNN: Opinion: Unlocking crime using biological keys

The report mentioned parenting classes, improving maternal nutrition and targeting children born in households with unhealthy habits, such as smoking, drug use and alcohol abuse.

BBC: Children 'failed on grand scale'

Because of the data already being collected about these people, the study allowed Saczynski's group to control for heart disease, heart attack, stroke, smoking, alcohol use and other factors that could have influenced dementia.

CNN: STORY HIGHLIGHTS