<p>I admire some users that ask a very general question but get excellent answers. Such as this question: <a href="https://stats.stackexchange.com/questions/50/what-is-meant-by-a-random-variable/54894#54894">What is meant by a “random variable”?</a> I am talking about the long answer for this question by @whuber.</p>

<p>I personally think this is not a good question, because too general. If I am asking it, probability will be close by <strong>too broad</strong> or get some answer like <strong>go to read a book</strong>.</p>

<p>But why such question exist and can get good answers? How can I do that? I am assuming this is not repeatable because it is randomly selected by some high reputation users?</p>
