Why are you attracted to a certain type? Why are you a morning person? Why do you vote the way you do? From a witty new voice in popular science comes a life-changing look at what makes you you.

I can't believe I just said that. What possessed me to do that? What's wrong with me? We're constantly seeking answers to these fundamental human questions, and now, science has the answers. Clever, relatable, and revealing, this eye-opening narrative from Indiana University School of Medicine professor Bill Sullivan explores why we do the things we do through the lens of genetics, microbiology, psychology, neurology, and family history. From what we love (and hate) to eat and who we vote for in political elections to when we lose our virginity and why some people find drugs so addicting, this illuminating book uses the latest scientific research to unveil the secrets of what makes us tick. Filled with fascinating insights--including how experiences that haunted our grandparents echo in our DNA, why the bacteria in our guts mess with our minds, and whether there really is a murder gene--this revolutionary book explains the hidden forces shaping who we are, pointing us on a path to how we might become our best selves.