Anytime you put a family of four together, you get interesting dynamics. It's a pretty humorous and explosive mix.

Everybody can identify with it. Everybody has traveled in a car, train or plane with somebody and knows what it's like to make last-minute decisions.

We've had all kinds of people, from age 21 to 70. As long as they are in good physical and mental condition, they are eligible. But we look for pre-existing relationships. That's the key.

They came to us as self-described nerds. And we couldn't disagree. But they are an adorable Midwestern couple. They are real people and a terrific team.

We are back to the format that has worked best: two-member teams racing around the globe.

We like to keep it real, we turn people loose, we let them do things all over the world, and we are just as surprised by the outcome as the audience is.