Asking a new question is a great way to unlearn. It can also spark creativity and help you see the world from a new and different perspective.
One of the better questions to ask those around you — or at the beginning of any meeting — is this: What haven't I heard before? (If you wish to be more blunt, you can simply demand those around you to "Tell me something I haven't heard before!"
Interested in some provocative questions to help you unlearn? Check out these old posts:
Questions, Questions … Always with the Questions
What Questions Aren't You Asking?