Researchers now believe they can predict bad behavior later in life, just from a child's behavior and life circumstances as a toddler. This is the last of a four-part series looking at early childhood.

Guest: Daniel Shaw of the Center for Parents and Children and the Pitt Parents and Children Laboratory at the University of Pittsburgh.

There's an intriguing new study that shows a connected between when low-income families receive supplemental nutrition, or SNAP assistance, and student test scores. The study is believed to be the first to show a connection between benefits of this sort and academic performance.

The authors of the study are Anna Gassman-Pines and Laura Bellows. Gassman-Pines is an Associate Professor of Public Policy, Psychology, and Neuroscience at Duke University. Laura Bellows is a doctoral student at the Sanford School of Public Policy.