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Correct? >> it can, yes. >> and it does that by swelling and the swelling, if you would just sort of tell us why the body swells or how the body swells up in the area of trauma. >> the body itself is reacting to the impact of something that's happened. so certain blood can rush to the area or more fluid underneath the skin can rush to that area and that's what produces the effect of the swelling. >> including lymph fluid, doesn't that wander over and white blood cells? >> they can. that's the purpose of the lymph system, to help with infection or foreign bodies, things like that. >> particular...

>> there is swelling there that i can see, yes. >> would that also possibly have resolved itself in the few hours -- in the 12 hours between this picture and when you saw him? >> it could have, yes. >> do you see an area up here that seems to be misshapen? >> in the photograph, yes, i see that. >> would that be an area of swelling? >> we call those scalp hematomas where blood can pool under the skin. >> how does a scalp hematoma occur? >> it can occur through trauma, so some sort of trauma to the head that resulted in the collection of blood there or fluid there. >> in effect in sort of layman...

Let me point you, did you see anything in this area of swelling? >> there is, as well swelling there that i can see, yes. >> would that also possibly have evolved itself in the few, in, the 12 hours between this picture and when you saw him? >> it could have, yes. >> do you see an area up here that seems to be misshapen? >> in the photograph, yes, i see that. >> would that also be an area of swelling? >> it's normally an area of swelling. we call those scalp hematomas where blood can pool under the skin. >> tell me how that occurs. how does a scalp hematoma occur. >> a hematoma can occur throu...

research, but it could also reduce the number of smokers. at least that's the intent. some say the law itself is flawed and big tobacco is fighting it tooth and nail. ahead of voting day california tv screens are full of ads. not for mitt romney or barack obama, but instead proposition 29. >> no on 29. >> and here's what's at stake. california voters will decide the fate of proposition 29 raising the tax by $1 on every pack of cigarettes. >> there's strem evidence from all overtime world that when you increase the tax on cigarettes, when you increase the tries, people smoke less. >...