10. "Pink slime" is on its way out—but it's not gone. Ground meat is commonly bulked up with what critics call "pink slime," butchering scraps that have been cleansed with ammonia. While the industry insists that its "lean, finely textured beef trimmings" are harmless, some experts are questioning the safety of the ubiquitous filler. Following a public outcry, the U.S. Department of Agriculture announced this month that school districts can choose between receiving beef with the trimmings or without, but at a higher fat content. A growing number of grocery stores, including Safeway and Supervalu, have announced that they're ditching so-called "pink slime." Still, it remains USDA-approved, and the food industry is free to use it.
Updated 3/22/2012: This article, originally published on October 17, 2008, has been updated.