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They throw in different types of scenarios that could have possibly been. that maybe some folks have not thought about yet. it could be bad when people speculate because some theories don't make any sense at all. such as a meteorite coming and taking the plane away for some spacecraft. so the investigators right now, neil, have to be very careful about which theories they're going to decide to look at. but i think they're going to at the end of the day probably take a look at each one. >> you know, it's interesting, when we have such iconic images that everyone sees and millions of people look...

Of the ocean near south wales. we're told they will be okay. important and dangerous work underway on the international space station. a key part of it in the history books today as two american astronauts ventured outside the station and successfully removed an old cooling pump. also during the space walk, a small oaring started floating away. >> it floated out, but it's -- i can get it. >> okay, copy that. best effort and get that in the trash bag as well. >> i got it, i got it, i got it. barely. have it. >> don't let that go. that's a stucking stuffer. >> yeah. don't tell my wife. >> yeah...

Will it fit inside a stocking? >> yes. it's a small o ring, part of the parts as they unscrew the screws to remove the pump, little parts that come out and he should have caught that and makes a nice souvenir for christmas. >> this is dangerous work, though. that's the whole point of this. what can go wrong? >> one of the things that could go wrong, of course, is that it -- undoing the screws, they tend to get real tight and astronauts sometimes have trouble loosening up the screws to remove the whole fuel pump. fuel pumps, are as big as a large size refrigerator. so these are one of the parts...

First american civilian in space. and because of that, a lot of kids around my age were watching the fateful launch in class. and 73 seconds after leaving the launch pad, "challenger's" right rocket booster's o-ring failed and the shuttle exploded. while the moon mission and apollo 13 may have been formative space moments for my parent's generation, the "challenger" disaster is the foundational space moment for me and for so many in my generation. and frankly, it kind of made me hate space. i mean, not hatred born of space itself. not the cold, airless qualities, and i like the stars, but beca...

Front landing gear is not down? >> not really. i think it's a minor problem if it is handled correctly. what he would have done if he knew he had a problem, he would have landed very nose high on the main gear until he could at the last minute lower it down on the nose gear, then it wouldn't have been very consequential. in this case i think the fact that he veered off the main runway at laguardia says he didn't know he had a problem until he sat down. bill: it takes some skill. southwest, how is that airline's record? >> well they have, in recent months they have been criticized for possibly ...