The Myers-Briggs Type Indicator is probably the most famous personality test in the world. Mari Buljo returns to Reason Bound to discuss this personality test with a skeptical Ryan. How far should people read into the validity of these tests, what is the history of the MBTI creation, and how much of a difference is there between these personality tests and a horoscope? Mari is one of Ryan's favorite guests and they first cover some history of how they met and interacted in class together in Tokyo.