What is a brain teaser?

As the name implies: the brain refers to thinking and thinking. Turning refers to driving to other routes when there are obstacles in front that prevent the car from driving in a straight line. A sharp turn is usually under special circumstances, and it is necessary to leave the customary route quickly and take another route. Brainstorming means that when thinking encounters special obstacles, you should quickly leave the habit of thinking and think about the problem from other aspects. Now refers to some intellectual questions that can't be answered by the usual way of thinking.