Being a curious person, I've always been fascinated by good and powerful questions (not to mention some good answers!). Recently, I've read two good books on the topic, A More Beautiful Question and The Book of Beautiful Questions, both by Warren Berger.
What interests me with questions is that they increase understanding (if we let go of our ego), help us connect with each other, and expose hidden opportunities. Just try "question-storming" in your next brainstorming session and see what comes up!
To remain creative, you must think and behave like a novice, always discovering—not like an "expert" who comes up with reasons why a new idea won't work.
Finally, you can't have good questions without active listening. Already the Greek philosophers knew that
you have two ears and one mouth and it's best to use them in that proportion.