How do you build this list of questions?

This list of questions is derived from two sources:

• Implicit questions:
  We monitor the terms people type into our search engine to understand the interests of those visiting the site.  We tailor the questions in this list to reflect the information needs implicit in the searches our visitors undertake.
• Explicit question:
  You may have noticed the next menu item in the pull-down menu presents an invitation to ask us a question.  We post the answers to these questions in this section.