We've done all that we can think, as far as testing in a one-G environment and simulating the effects of our (shuttle) maneuvers on the mast. But there is that element of risk that there may be something we didn't get, that we don't quite understand.

The shuttle missions that have gone to the station so far have been extremely successful. This mission takes the level of complexity up a notch.

It goes back to, how likely is it that you'll have a defect? Very low. And what is your test experience? Overwhelmingly positive. Then you look at your design, and your design is to be very safe. And you look at those, and it's a compelling story.

We're satisfied that the necessary precautions have taken place or we wouldn't launch.

This is a great tire. Some guys were throwing out some great shots (in testing) when the weather was cool, but I knew that when it came to race day and it got a little warm out in the middle of the day, it would be a challenge, and that's what we worked on in testing.

We will be purchasing recycled materials to show we are conscious of the environment, and our students will be aware of it as well.