DEAR HELOISE: I understand that baking powder has a shelf life, and that it can go bad. Can you tell me how long it remains good? — Joe and Kay, via e-mail It does have a shelf life, and here’s how to ...

Claire is Lifehacker's Senior Food Editor. She has a B.S. in chemistry, a decade of food journalism experience, and a deep love for mayonnaise and MSG. At any given moment, I have at least one open ...

Rachel Fairbank is a freelance science writer based in Texas. When she is not writing, she can be found spending time with her family, or at her local boxing gym. What do you do if a recipe calls for ...