A fascinating interview with Charles Koch - link:
"So the next step is I want to apply this in our businesses. So I said, "Okay, we've got to build better information sources, better knowledge sharing, and have a challenge culture here -- that no one has all the answers." And if you're a leader at any level and your people aren't challenging you, you've got to change that or you can't be a leader here because you're not going to be using ideas, you're not going to have innovation, you're not going to fully develop your people. And if you're working in a group and you don't challenge, then you're not really doing your job."