Why is there no challange review??
we are here to learn something, challanges are a way of practicing what we have learned, but in challanges, all you got is some seconds to look at a question, and when your answer is wrong, there is no way (if there is, don't hesitate to inform me please! ) to see the right answer or a brief explanation of why the right answer should be that. I guess sololearn should change the quiz factory so that when adding a question, one "must" add an explanation about the right answer, and allow review for questions.