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Of my admiration and respect for being able to do this for the greater good. >> reporter: john has volunteered to be one of the first people in the united states to participate in an operation to inject stem cells directly into his spine. it's called a phase one clinical trial. this is the first step. no one knows what will happen. here's how john got to this place. >> two years ago i was running. playing golf. >> reporter: then gradually, literally, he began to lose it. >> started tripping and like a foot drop. started catching my foot on bricks and curves and started losing my balance offici...

What is going on in china? just this week alone, three cases of men attacking schoolchildren with knives or a haerm. another man executed for stabbing kids to death. it's looking like cope cat crimes. >> reporter: horrified residents wait outside ak kindergarten. kids were wounded in the rampage. it was too hashl to imagine says this eyewitness. i saw blood everywhere and kids bleeding from their heads. that was thursday. similar horrific images played out in other chinese scities. this knife-yielding man is

We've spent our whole career working on that. >> reporter: right. >> what is interesting, it's one of those things where you never know. it could be not as bad as we think. it could not reach certain areas. so we're all keeping our fingers crossed because there are so many livelihoods at stake. >> reporter: yes. there's one side that says, let's be glad for what we have and see what brings tomorrow but the potential is still there. those are the two sides, really, in terms of what you're saying with locals and how they are dealing with it personally. >> thank you so much, richard

Have gotten knocked around by the waves? >> well, yeah, whenever you turn around, you could get rolled over. >> but this is a big boat. most people would say that it cop handle could handle it. >> no, no way. >> reporter: what about boats on this size, did they have to go back to shore? >> if they were on boats this size. the waves are higher than 10-foot plus. so they could handle it right now. >> reporter: i can tell thaw it was almost impossible for either of to us stand at this point. the wind, waves, so strong and so big at that point that it knocked off an instrument-like cluster inside ...

Willing to do this for the greater good. >> reporter: the greater good. you see, john has volunteered to be one of the first people in the united states to participate in an operation to inject stem cells directly into the spine. it's called a phase one clinical trial. this is the first step. no one knows what will happen. here's how john got to this place. >> a few years ago i was running, playing golf. >> reporter: and then gradually, literally, he began to lose it. >> started tripping, foot drop and started catching my foot on bricks and curbs and started losing my balance initially and the...