The Bielefeld School is a group of educational researchers from Germany. They have developed a new way of teaching called "Problem-Based Learning." Problem-Based Learning is a method of teaching where students use real-world problems to explore and learn different topics. The students are responsible for doing research and finding solutions to the problems they are given. They learn by trying to solve the problems, rather than being taught a set of facts or equations. This method of teaching is used in many schools and universities around the world, and it has been proven to be successful in helping students to become better thinkers and problem solvers.