The problem I've seen with the computer science is that the same several people are always on the hot list. If somebody makes a really cool, really original program, they are less unlikely to make ...

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3. Publish button.

Khan academy did studies on it, and came up with this result, after you complete questions, you have to wait fifteen hours to make sure you have learned the skill properly. You can't get around it,...

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3. How do I stop the system from locking my students out of MASTERY CHALLENGES when they get a long series of questions correct?