. >> the first person to catch our attention is principal investigator jack dibb and he means business. he runs back and fort on his station like a madman. >> it is a especially designed inlet where it's got a small hole that expands to come through the wall of the airplane. >> what are you collecting in there? >> we're collecting any particle that is bigger than about 5 microns. we are measuring the ions that are in those particles,. >> dibb doesn't like what he's finding. >> the results that you guys get does it make you concerned about the future of our climate? >> i'm not hugely optimistic. >> more from dibb's findings later and some of his answers may change your thinking. the seachrs mission flies three times a week and so does many of the experimentalists. the flight is not for everyone. the flight continues. >> gets bumpy. >> i even hit my head when i was trying to get back to my seat. >> there are things that are occurring in the air that you just can't see. we dropped like a rock and then you experience zero gs. >> you know what? people is iting down. >> two hours into the mi