When it comes to keeping or tossing the stuff in our kitchens, we tend to waffle: Do I need to get rid of that old cutting board? Is this leftover chicken still good? To get to the bottom of these debates once and for all, we reached out to Marianne Gravely, a senior technical information specialist at the Food Safety and Inspection Service of the USDA. Here, she points out 11 things you should really throw away ASAP.