This week on Know It All, Greg Brown and Mitch Moffit from AsapSCIENCE wonder …why do we experience the whole quarter-life crisis thing? Inspired by the new season of Emily in Paris, they dig into the science behind puberty, the cultural shifts toward extended adolescence, and how things like college and major life events in our 20s - from breaking up with a partner to getting fired from a job - can wreak havoc on our sense of security and our sense of self. Hence: the quarter life crisis.