WASHINGTON — Gerald Zirnstein, a former U.S. Department of Agriculture scientist, has told ABC News that 70% of ground beef sold at supermarkets contains filler called “pink slime,” a phrase that he coined while working at USDA. The filler consists of salvage trimmings of beef that are sprayed with ammonia to kill bacteria, then simmered at low heat and then spun in a centrifuge to separate out excess fat. The beef industry describes the result as “lean finely ...

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