jemison, the first african-american woman astronaut in space. dr. jemison, thank you for being with us. tell us a little bit about what they're experiencing out there in space as they are out there with this thing that is the size of a fridge, even though there's weightlessness, what are the issues they're facing? >> i think you had been talking about it before. one of the issues is that the coolant pump itself has a lot of mass or weight. even though it's weightless, you might think about being in a big tank of water, even though you could move it and you normally couldn't, it still requires you to put a lot of strength and effort in it. what we have to look at when we talk about this particular space walk is that even though it's taking three when originally they thought it would take two, i would never classify the first space walk as unsuccessful. this is equipment that's been in temperatures ranging from plus