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Pings are from the black box. tell me why. >> i believe so. because its not just reception of a radio station but its like reception of a radio station where theyre broadcasting specific tones. these tones -- >> at one-second intervals, correct? >> thats right. and that can be measured to precision of, say, 1/10,000 of a second. so we know when we get something that is that periodic -- >> because theres nothing else in nature that would make that sort of frequent sound with regularity. >> no, no...

It is a known signature they can look for it. thats where guys like paul come in. >> thats the thing. many people were saying, this could be ocean life, it could be a whale, a tag. do, it could be any sort of military signal that they use for testing. youre saying there are signature thats are specific to these boxes. >> i think dolphins have high intelligence but i dont know that they could repeat the exact pulse safe. >> the tag. the tag that they use on the dolphin to track them. >> possible....

get them out of there. >> well show you what they were up against, all the factors big and small that spelled the difference between life and death. also tonight as we continue to remember the victims, as they lived not just as they died. tonight we speak to the mother of rebecca wingo. a young woman with a whole life ahead of her. she mastered mandarin by the age 20, raised two daughters, working her way through school, training to work with troubled teenagers. she joins us later. we ...

>> well show you what they were up against, all the factors big and small that spelled the difference between life and death. also tonight as we continue to remember the victims, as they lived, not just as they died. tonight we speak to the mother of rebecca wingo. a young woman with a whole life ahead of her. she mastered mandarin by the age 20, raised two daughters, working her way through school, training to work with troubled teenagers. she joins us later. we begin with breaking ne...

she mastered mandarin by the age 20, raised two daughters, working her way through school, training to work with troubled teenagers. we begin with breaking news. a package from the shooter found in the news room. he mailed it days before the massacre, addressing it to one of his professors at the university of colorados campus in aurora. it arrived days before the shooting but was not discovered until monday afternoon when police found it in the mail room. they sent in the bomb squad, ...

remember the victims, as they lived not just as they died. tonight we speak to the mother of rebecca wingo. a young woman with a whole life ahead of her. she mastered mandarin by the age 20, raised two daughters, working her way through school, training to work with troubled teenagers. she joins us later. we begin with breaking news. al package from the alleged shooter found in the news room. at the university of colorado. he mailed it days before the massacre, addressing it to one of ...

before too many thousands more die that russia and china will stop protecting assad and allow this council to play its proper role. >> because of the battleground states in the presidential race, florida is a big prize, and no surprise that president obamas campaign is there today. he kicks off with a rally in jacksonville, and it is scheduled to begin in 15 minutes from now. we will take you live to that event. as the president campaigns in florida another national poll shows him in a...