How are the teachers motivated?
I'd gladly sit down and pass on everything I know about programming (not a lot!), unix, amateur radio, aviation etc because as long as it's an interest of mine, I love talking about it. Having someone willing and/or eager to listen is even more motivational.
Have always felt teaching was one of the best ways to learn. Good students will force you to respect many of the fundamentals that you never had the patience for in school or when you're working in your field day-to-day.
I'm not sure part-time would work for elementary school, but past that? I think it would work.
Maybe if users have to pay a subscription fee to gain access... The company takes a cut, answerers get a cut.
I bet it could work.
So yeah, it is possible.
He would find the professor's home, and announce "My brain is open," and they would work together.
The most scandalous of these activities involves his masturbation in the marketplace, to which he responded he wished it were as easy to relieve hunger by rubbing an empty stomach.