Most people don't know it, but the all-volunteer Idaho Mountain Search & Rescue Unit's largest regular source of income comes from corn. Not just any corn, mind you - locally grown, boiled corn-on-the-cob that the group sells each August at the Western Idaho Fair. They've been doing it for 45 years. The 60-member search and rescue group, which is best known for its high-angle rescues in the mountains, sells corn for $2 an ear. The group makes $12,000 to $15,000 a year to fund rescue efforts (that's after costs, including 6 percent sales tax and the fair's 20 percent cut of proceeds). The money the group makes is up to half its annual operating budget of about $30,000. The IMSRU booth is the longest-running at the fair, and one of only a few run by nonprofits, according to fair concessions manager Mike Oster. Party Pups and Bonaminio aren't far behind at 43 and 44 years, respectively. The average length of stay of a food vendor is 15 to 17 years - a...