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Pings are from the black box. tell me why. >> i believe so. because it's not just reception of a radio station but it's like reception of a radio station where they're broadcasting specific tones. these tones -- >> at one-second intervals, correct? >> that's 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 there's nothing else in nature that would make that sort of frequent sound with regularity. >> no, not without the fish or sea life becoming very, very tired. >> right. >> over that period of time...

It is a known signature they can look for it. that's where guys like paul come in. >> that's 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. you're saying there are signature that's are specific to these boxes. >> i think dolphins have high intelligence but i don't know that they could repeat the exact pulse safe. >> the tag. the tag that they use on the dolphin to track them. >> possible. >> i was going to say that the animals aren't quite good enough to do 1/10,000 of a second. ...

get them out of there. >> we'll 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 news. al package from the alleged shooter found in the news room. at the univer...

>> we'll 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 news. a package from the alleged shooter found in the mail room at the university of colorado. he mai...

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 colorado's 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, handled it by robot and x-rayed the parcel just in case. sources telling john miller who joins us n...