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A new study on bullying shows that people who were bullied have higher rates of psychiatric illness as adults. Host Michel Martin speaks with the study's lead author, William Coleman of Duke University, and bullying expert Rosalind Wiseman.

The shooting of Florida teenager Trayvon Martin one year ago became an international story, and raised difficult questions about race and justice. Host Michel Martin continues her conversation with Robert Zimmerman Jr., the brother of accused killer George Zimmerman, about how his family views the case and the public reaction.

Unarmed Florida teenager Trayvon Martin was shot and killed one year ago today. Host Michel Martin speaks with Robert Zimmerman Jr., the brother of accused shooter George Zimmerman, about his brother's actions that night and the upcoming trial.

Tuesday marks one year since the fatal shooting of unarmed Florida teen Trayvon Martin. The case has drawn a lot of national attention and polarized America on issues of race and self-defense. Host Michel Martin checks in again with Trayvon's mother, Sybrina Fulton, and her attorney, Benjamin Crump.

"To compete well means to take risks that are normally constrained by fear," Po Bronson tells NPR's Michel Martin.

Following their best-selling book, NurtureShock: New Thinking About Children, Bronson and Ashley Merryman teamed up again for Top Dog: The Science of Winning and Losing.

Bronson says "risk-taking is a crucial quality of competitiveness." Science shows that "if you focus on the odds, you tend not to take the risk," he says.