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The big question is how did they get to florida from the their native africa? >> did they fly? >> did they, took a long trek didn't they? >> somebody brought those critters over. someone needs to fess up to that one. and later this half-hour, what makes an ordinary hit into one of the catchiest songs of all times. some researchers have discovered a successful musical formula. you have to hear it. >> so glad we picked "ymca" for that clip. ♪ >> oh, yes. before all of that, though, this could be the end of a very long wait for the family of amanda knox. >> in italian jury is deciding the a...

Four key elements or x factors. ♪ >> reporter: number one, long and detailed musical phrases. ♪ entertain us >> reporter: number two, multipitch changes in the song's hook. number three, male vocalist. ♪ brown-eyed girl >> reporter: higher male voices making a noticeable vocal effort. ♪ living on a prayer >> reporter: using this formula, a list was compiled of the top ten catchiest songs of all time. "final countdown" by europe made the cut. so did the theme song from "baywatch," "i'm always here" by jamie jamieson. number two catchiest song of all time almost acted out as much as it i...

Heels. they've got a media center, a library, a clinic, a kitchen. they're staying for the long haul. >> seems like a long-term initiative down there. we have seen the protests in london, the arab spring. people are speculating is this america's version of that kind of uprising not to that level. the manifestation of the similar problems we are having here. >> seems like they will have to crystallize their message for people to understand what they're really protesting. >> broad spectrum of things they're tackling. all right. shifting gears now, the cia contractor freed after killing two pak...

The power ballad, a global sports anthem. ♪ we are the champions >> reporter: "we are the champions" by freddie mercury and his band, queen. t.j. winick, abc news. >> i don't agree with all the songs. "ymca," definitely. >> my lord. >> yes, you would know a little about that wouldn't you, rob. >> oh, my lord. >> coming up with the lyrics to that one. >> i have no comment. ♪ ymca >> oh, my lord. >> coming up with the lyrics to that one. >> i have no comment. ♪ ymca

The name of the camp included a racial slur, the n word more or less. now going back and forth over the sign being painted over. >> the sign was painted over. no one can determine when. some say as recently as a few years ago. >> perry says they repainted over the sign with the word on it 30 years ago. >> a lot of people will be talking about this. >> a hot point today, yes. >> rival candidate, herman cain said the name of the hunting camp and the fact that perry had been going there shows a lack of sensitivity. he said that particular word has no place in the modern world. earlier in the week...