What does a good Skeptics.SE question look like? What are the qualities that a perfect Skeptics.SE question would have?

Ground rules for answering this meta-question:

• One quality per answer
• Provide a brief explanation of why it is important.
• Use the comments for discussion.
• If you don't agree, downvote the attribute. If you agree, upvote.

Related Question: What are the attributes of a good answer?