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as you explain, basically saying we would not carry out any operations inside pakistan, and in return, you would allow us, our senior leaders, to exist and live here in pakistan without coming after us. the key here is that u.s. officials say at this point they don't see any evidence that al qaeda actually presented this plan to pakistani officials. right now all they have is that it atears to be an internal discussion. >> cnn got immediate reaction from the u.s. ambassador. let's listen to what he said about this. >> you can think of many things of wanting to do them and so did osam...

About. what they found is by doing a spinal tap they get really important clues. this is a model of the spine. this is the back of the spine here. a spinal tap involves -- somebody usually hunches over, bend their back out. put a needle right through a couple of bones over here. and right through the spinal sack and take a little bit of fluid from that area. >> have you done that before? did somebody else do that before you take a look at the -- >> no. i have done this procedure. a lot of people in the world of neurosurgery do this procedure quite often. a lot of primary care doctors don't do ...