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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.

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MICHEL MARTIN, HOST:

Now, we turn to a giant in the arts world. You probably know the name, Anna Deavere Smith. You might know her from her role on "The West Wing" or as the no-nonsense old school hospital administrator, Gloria Akalitus, on the Showtime series, "Nurse Jackie."

(SOUNDBITE OF TV SERIES, "NURSE JACKIE")

UNIDENTIFIED MAN: How do you sleep at night putting someone out of a job?

The movies Argo and Life of Pi and actors Daniel Day-Lewis and Jennifer Lawrence were among the winners at Sunday's Academy Awards. But no one movie swept the show.

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STEVE INSKEEP, HOST:

Good morning, I'm Steve Inskeep. Betty LeMaster watched a television program in Smyrna, Tennessee - a show about geology - and it got Ms. LeMaster wondering about the 10-pound rock she'd used as a doorstop for years.

She took it to Middle Tennessee State University and according to the Daily News Journal, testing revealed her doorstop is fossilized coral 450 million years old. Older than the dinosaurs, and still holds the door just fine.

It's MORNING EDITION. Transcript provided by NPR, Copyright NPR.