The biggest challenge is the variability of the atmosphere.

We're not low enough to touch Mars' atmosphere yet, but we'll get to that point next week.

Their challenge is to become a good corporate citizen, which means not always being the star of the show but being a supporting player. That might mean sometimes standing under the spotlight; at other times it means taking a seat in the orchestra pit.

It's safe to say that we will challenge it all the way. This is one battle that we must make a stand on because our financial futures depend on it.

Even corporate executives who have been hostile to the environment are waking up to the realities. The challenge is what do they do about it. And there is still a huge gap between recognizing the problem and doing something about it.

We want to place well in league and we want to challenge all the kids. But the numbers are low. The margin for mistakes is very thin. There's no room for mistakes or injuries.