Thanksgiving is this week, and you’ll probably have some leftovers. “First in, first out” is one of the best ways to prevent food spoilage. It just means to rotate your foods so the older items are right in front. That way you’ll use them first, and you won’t discover them weeks or months later, covered with mold. Put fresher things in the back as soon as you stock up on groceries. And if you cook ahead to use leftovers, keep track of what you have and use the oldest foods first. Watch dates on refrigerated foods like milk and yogurt, and write the name and date on everything you freeze. Avoid having to throw spoiled foods away —“First in, first out” can save you money and frustration.