As the foundation of virtually every baked good you'll ever make, flour is a must-have pantry staple. And you'll likely use a lot of it over the course of a year (hello, holiday cookie baking, weekend ...

You are about to whip up a batch of cookies or muffins, or a birthday cake, only to discover that your flour smells or looks a little funky—or, worse, has some creepy crawlies in it. There are a few ...