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A gluttonous predator is power-eating its way through reefs from New York to Venezuela. It's the lionfish.

And although researchers are coming up with new ways to protect some reefs from the flamboyant maroon-striped fish, they have no hope of stopping its unparalleled invasion.

Lad Akins has scuba dived in the vibrant reefs of the Bahamas for many years. But when he returned a couple years ago, he saw almost no fish smaller than his hand.

Yet another movie about Jackie Robinson arrived as baseball held its annual commemorative celebration of No. 42, but officials of the game are fretting over the fact that only 8 1/2 percent of current major leaguers are black.

Given that African-Americans only constitute about 13 percent of the U.S. population, and that rarely do we have any industry or school system or community population that correlates exactly to the whole country's racial or ethnic makeup, baseball's somewhat smaller black cohort hardly seems like an issue to agonize over.

President Obama makes a statement about Monday's explosions at the Boston Marathon. Morning Edition co-hosts David Greene and Steve Inskeep speak to NPR reporters covering the story in Washington and Boston.

President Obama said the FBI is investigating Monday's twin bombings at the Boston Marathon "as an act of terrorism." Meanwhile, law enforcement officials are asking the public to submit photos and videos from the scene. And Boston Mayor Tom Menino said that as the city grieves the victims it is also proud of those who helped in the explosions' aftermath.

Morning Edition co-hosts Steve Inskeep and David Greene discuss the investigation of Monday's Boston Marathon explosions with Roger Cressey, a former counterterrorism investigator and member of the National Security Council, and NPR's Dina Temple-Raston.

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DAVID GREENE, HOST:

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STEVE INSKEEP, HOST:

Witnesses to yesterday's Boston Marathon explosions include David Abel. He's a reporter for the Boston Globe. He was at the finish line yesterday afternoon around 3 o'clock, and Mr. Abel, what did you see and feel?

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STEVE INSKEEP, HOST:

Good morning. I'm Steve Inskeep, with congratulations to Bill Iffrig, who ran the Boston Marathon at age 78. He was approaching the finish line when he saw the explosions. Video footage shows him tumbling down. Mr. Iffrig saw scrambled images, smoke in the air, maybe a fragment of what he thought was a bomb, but he stood up and walked the last few feet to the end. He told the Herald of Everett, Washington: When you've run 26 miles, you're not going to stop there.

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STEVE INSKEEP, HOST:

It's MORNING EDITION from NPR News. I'm Steve Inskeep.

DAVID GREENE, HOST:

And I'm David Greene. Good morning.

The lead agency in yesterday's Boston Marathon explosions is the FBI. Federal investigators say this morning they are doing all they can to get answers, but there is still much they do not know.