It is imperative that a student learns critical thinking because not all the answers will come to them through a math equation or through reading. It may take some thought and analysis to formulate a response or judgment that they deem appropriate. Critical thinking can be used in science, especially to ask questions about the world. Carl Sagan clarifies this in the article. “Can we know the universe?” saying: “As a result, science sometimes requires courage – at the very least the courage to challenge received ideas” (1). Although it can be scary to question what we are taught, it shows a curiosity about the subject and opens a new way of thinking about the people around you. Science, in a sense, seeks to find new information that can prove to the world what it is. It is a way of understanding the universe and how it connects to us as a whole. Reflection is a step forward towards acquiring new knowledge. The mind is not filled with knowledge of the world, rather it is an empty container that we must fill not only by going to school, but also by thinking critically about the things we are taught. Galileo's letter to the Grand Duchess is an excellent example. In this letter he expresses his frustration with non-believers who say his Copernican model calculations are incorrect and do not follow the Bible, when in fact they do. He states: "I do not feel obliged to believe that the same God who endowed us with senses, reason and intellect has [refused] to use them and, by other means, to give us the knowledge that we can achieve through them” (5). ). Essentially, it expresses that God gave us a mind because He wants us to think. This is a very important asset for a person because we possess all of these senses as well as the ability to reason. Education must focus on these two points, because critical thinking requires both the power of reasoning and feeling. Without