There are some things you might not want to know about the food you eat. For those who aren’t fazed by stories of hormones, chemicals, and cruelty, the Midwest Independent Film Festival is sponsoring a free 7 PM screening of Food, Inc., a documentary about agribusiness that opened last week, at Landmark’s Century Centre Cinema (2828 N. Clark). Print passes here, and arrive early, as the site warns that the screening may be overbooked.