There's no denying it, I'm a city boy through and through. Yet when the offer to ride along in a combine, harvesting soybeans arrived in my inbox, I couldn't reply fast enough. A mere 75 minutes from my desk and I was sitting in the jump seat of a John Deere 9500 - at about $250,000, by far the most expensive wheeled vehicle I've ever taken a ride in - on Jeff Gaska's farm near Columbus.