If I’m selecting a group, the first thing one has to look for is a record of achievement. It may be modest achievement, but people have shown that they can persist, they can carry out objectives and get to a final solution. If they can do that on small things, there’s a very good chance that they’ll perform well on big things at the same time. Then, I’m a great believer in a really good sense of humor. If you have someone in an expedition who’s reasonably competent and has a great sense of humor, they’re a very stimulating factor for the whole team, and they play a very important psychological part, I think in the success of the team.