With restaurants and fast food chains slowly returning tomatoes to their menus, the Tribune has an interesting profile of David Acheson, the "food safety czar" at the Food and Drug Administration. The piece details the Gordian knot Acheson's been trying to solve in order to track down the source(s) of the salmonella outbreak that's led to 277 documented cases and sent 43 to hospitals across the country. Acheson admits in the article that, because tomato......