This is the latest installment of Harvest Public Media’s Field Notes , in which we talk about important issues related to food production. For more than a decade, fans of documentary film have flocked to Columbia, Mo., for the annual True/False Film Fest . The screenings start on Thursday. Many of this year’s films are set in big cities -- like Cairo, Rome and New York. But several works also focus on rural life. " Rich Hill " follows three teenagers growing up in a small Missouri community