Critical thinking is an important and vital topic in modern education. All educators are interested in teaching critical thinking to their students. Many academic departments hope that its professors and instructors will become informed about the strategy of teaching critical thinking skills, identify areas in one's courses as the proper place to emphasize and teach critical thinking, and develop and use some problems in exams that test students' critical thinking skills. The purpose of specifically teaching critical thinking in the sciences or any other discipline is to improve the thinking skills of students and thus better prepare them to succeed in the world. But, you may ask, don't we automatically teach critical thinking when we teach our subjects, especially mathematics and science, the two disciplines which supposedly epitomize correct and logical thinking? The answer, sadly, is often no. We should be teaching students how to think. Instead, we are teaching them what to think (Clement and Lochhead, 1980).