What is considered as a GOOD discussion?

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I was just wondering about this, as my discussions haven't gotten really much replies yet and I've been here for nearly a week. What kind of discussions are really popular here, and what kind of discussions usually get the most responses? I just can't think of any good discussions where any one would be able and want to reply on. So, what do you see as a good discussion? What should a discussion question, or offer, for it to be considered as a good discussion?