 Welcome to this chapter of the Open for Inside course, where we work on some basic philosophical topics revolving around the question, what is true? We want to find out how we can learn things about the world, how we can know how the world works. More specifically, we will address three areas. First, how can we know things are true? In other words, how can we verify what is true, fact, and real? Second, how can we know things aren't true? In other words, how can we falsify a speculation and show it is indeed not true? And third, how can we rely on things we think are not false? In other words, how can we rely on the works of others, the paradigms and programs established rigorously before we came along and then continue to add to them? Basically, we'll take the gist of theory of knowledge and philosophy of science and take them into the real world. We'll use examples from different areas of science in everyday life to illustrate the key takeaways and there will be some interesting questions for you to work on after watching the videos yourself. In any case, I think it is an important issue to understand the basic ideas of philosophy of science, because if you do, these concepts will make it much easier for you to figure out if a claim that is presented to you as a real insight really meets the criteria you believe in. I hope that by the end of this chapter, you will agree with me that this is an interesting, important, and intriguing topic. So, let's get started.