Crain’s Chicago Business (Feb. 13) -- About 150 miles south of Chicago, past open fields and small-town water towers like pushpins on the Illinois map, you'll find a surprising corporate outcropping. Twenty-five big-name businesses—from Dow Chemical to Yahoo—have set up shop in a cluster of buildings at the University of Illinois Research Park in Champaign. The draw: The university is one of the country's biggest producers of computer science, math and engineering students, a resource corporate America is desperate to tap.