Fast money. Fast cars. Fast sex. Many people live the fast life. From actors, athletes, and rock stars to inner city suburban youth and hunter-gatherer tribes in rural Brazil. Was living the fast life evolutionarily adaptive for some, if not most, of our distant ancestors? Recently, psychologists are taking a deeper look at the fast life, applying evolutionarily informed principles that have traditionally been used to investigate difference among species, to look at variations within our own species. This research has important implications for a wide range of diverse fields and has serious consequences for a variety of prominent social issues. In this first part of the series, I describe the fast-slow continuum based on Life History Theory and discuss its evolutionary basis.