A free gateway to the answers and information you need
Quora is a free app connected to the ask-and-answer website of the same name. On Quora, people ask questions about a huge variety of subjects, and other users (who are generally enthusiasts or knowledgeable about the subject) provide various answers. Answers are then rated, a credit of sorts is earned by the one answering, and all involved move on to more questions and answers. It's a great app to use for something specific or simply to browse.