QUOTE : As a species, humans straddle a line between external and internal intelligence. With big brains and (typically) small clan size, humans have traditionally harnessed individual cleverness to outcompete rivals for food and mates, to hunt and dominate other species, and, eventually, to seize control of the planet. As later chapters will show, we have also externalized our wisdom in the form of trails, oral storytelling, written texts, art, maps, and much more recently, electronic data. Nevertheless, even in the Internet era, we still romanticize the lone genius. Most of us—especially us Americans—like to consider any brilliance we may possess, and the accomplishments that have sprung from it, as being solely our own. In our egotism, we have long remained blind to the communal infrastructure that undergirds our own eureka moments.