distinctive voiceprint you can match the voiceprint, you know, to existing sounds of his voice and they match. so i mean, there's no doubt in my mind this is him. >> so you said about 30 since 9/11. that's 30 in the past nine years or so. we've seen two now back-to-back days. why is he speaking now? >> i think part of it is a proof of life, t.j. he's been keeping pretty quiet, he and his number two, al zawari. i think releasing fewer tapes maybe concerned about their security. the drone attacks may be interrupting their operationsmeoperations. but them, getting a tape out around the 9/11 attacks is important. we saw a tape out a few days after the attacks, and here is bin laden now with two. and i think it's just a reminder that they're still alive and