This lecture belongs to Professor Joe Halpern’s lecture series. This 3-part lecture series includes some fascinating insights on game theory, the uncertainty that rules our daily life and to which extent common knowledge affects our decisions. The talks are appropriate for a general audience since it does not require knowledge in mathematics. Thus, whether a high school or university student, or a distinguished professor, everyone will learn something new. The only thing you need to bring with you is your curiosity. Part of the talk is interactive, so you will have the chance to actively participate, in an effort to give answers to fundamental philosophical and practical questions.