Each of us thought about why he was doing one way or another - sometimes with enthusiasm, more often with annoyance. For a long time, no one knew the answer to these questions, but now science is ready to tell us why we love some dishes and hate others, how we choose friends and partners, why we experience certain feelings. Bill Sullivan is a specialist in genetics and microbiology, and also an avid lover of pop culture. With scientific precision, humor and references to cult films and TV shows, he talks about the things that make us ourselves: genes, microbes and neurons, and how the small and inconspicuous rules us.