Mike Krzyewski, the men's basketball coach for Duke University since 1980, is basketball's all-time winningest coach. Most people know him as just "Coach K." But he's not just a coach; he's also a genius at creating teamwork. Here's one of his keys to success:

In our program, the truth is the basis of all that we do. There is nothing more important than the truth because there's nothing more powerful than the truth. Consequently, on our team, we always tell one another the truth. We must be honest with one another. There is no other way.