1. Közösség
2. News and Updates from Khan Academy
3. Content update: Brand new high school physics and biology courses are coming soon!

I have some concerns about this plan. Why not just introduce the new courses and maintain the old ones, with both being mastery-enabled courses, instead of completely replacing the older courses be...

1. Közösség
2. Content Requests and Feedback
3. Course on Logic

Exactly what I was thinking. Formal logic!