Notes

We want to help users, find great questions for increasing their knowledge and hence their reputations via their answers on the website stackoverflow. There are 1.5 million questions on stackoverflow and around 50000 tags on stackoverflow. Among those tags are some very important tags/topics like Operating system, data structures, algorithms, python etc. We want the user be able to understand such topics by answering questions them. So the more the user answers, the more will be his reputation via the score he gets on the answers and thus more will his knowledge. So mutexes vs semaphores can be thought of a single question which we want the user to master, we show him a question on it, and then show him linekd questions to him expecting him to answer the question. Only this way he will be able to learn the question and among all the questions on stackoverflow about mutexes and semaphores, he answers any question and achieves high scores means he was able to learn the concept.