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When it comes to farm raised fish, it doesn't pay to let them be lazy. Fish like wild salmon, tuna and eel are built for the vigorous swimming required during migration.

These fish are "uniquely adapted to a physiology of high levels of exercise performance," says Tony Farrell, who studies fish physiology in the University of British Columbia Zoology department. "Therefore when we put them in constrained environments and remove predators, the consequences are they become a little more like couch potatoes."

One of the most interesting stories from over the weekend was the move by people in Benghazi, Libya, against the armed extremist groups that had been operating in their city and which have been linked to the Sept. 11 attack on the U.S. consulate there that left Ambassador Chris Stevens dead.

Good morning.

Our early headlines:

-- Debate Preview: Obama And Romney Shadow Box On '60 Minutes'.

-- 'Amazing Scene' As Riot Shuts Foxconn Plant In China.

The first official presidential debate isn't until Oct. 3 in Denver. But as The New York Times writes, last night on CBS News' 60 Minutes there was something of a "shadow debate that offered a likely preview of the tone and substance" of what will happen on stage next week.

Sunday's sad news about the death of a giant panda cub that was just less than a week old is being followed this morning with reports about how the staff at Washington's National Zoo tried hard to save it and have been hit hard by its death.

At one point overnight as many as 2,000 workers at a Foxconn plant in Taiyuan, China, were involved in a riot that drew 5,000 police officers to the site and has closed the facility that makes parts for Apple's iPhones and hardware for other companies including Microsoft and Hewlett-Packard.

Transcript

DAVID GREENE, HOST:

Good morning. I'm David Greene. Sandy Crocker has gone more than 500 miles for love. The Canadian man was touring in Ireland when he met a freckled woman with reddish brown hair. They spoke for a couple minutes at a café, then she left. Back in Canada, he was heartbroken.

(SOUNDBITE OF SONG, "I'M GONNA BE (500 MILES)")

THE PROCLAIMERS: (Singing) But I would walk 500 miles, and I would walk 500 more...

Transcript

STEVE INSKEEP, HOST: