The TWO questions to tell if you really know something

Most people never questioned themselves about the level of certainty they have about their beliefs and "knowledge". They misjudge mere possibilities by absolute certainty, and that's the recipe for catastrophe in life. Beyond that, they never ask themselves "what is it that I DO NOT KNOW about this subject?", and as it turns out that question is often more valuable than asking yourself about what YOU DO KNOW on the topic at hand. I reflect on these two points in this video.