"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.

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.

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Okay. The movies "Argo" and "Life of Pi" and the actors Daniel Day Lewis and Jennifer Lawrence were among the winners at last night's Academy Awards. NPR's Mandalit Del Barco was backstage.

MANDALIT DEL BARCO: It wasn't a Hollywood star who announced this year's Best Picture. That honor went to First Lady Michelle Obama via satellite from the White House.

MICHELLE OBAMA: And the Oscar goes to "Argo."

Kellogg and its foundation "Kellogg Corporate Citizenship Fund" plan to increase access to breakfast around the world. 

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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.

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STEVE INSKEEP, HOST:

Good morning, I'm Steve Inskeep.

Jennifer Lawrence won the Best Actress Oscar for "Silver Linings Playbook." Surely, that will be remembered longer than her performance at the Academy Awards. On the red carpet she used a four-letter word which ABC bleeped. Inside, she fell on her way to accept the award. Later, reporters asked how she'd prepared for the evening. Lawrence said her family had taken over her house and at some point, quote, "I did a shot." It could happen to anybody.

Five-time NASCAR champion Jimmie Johnson reclaimed his spot at the top with a late push in Sunday's race. Danica Patrick was the first woman to start from the pole, but she went on to finish eighth.