I can’t count the number of times I’ve been in the kitchen and realized I’m out of ketchup, and then I tell myself to pick it up the next time I’m at the store. When I’m at the store, however, it never crosses my mind to pick up the ketchup — until I walk back into the kitchen and realize we’re still out of it. There’s something about being in the kitchen that jogs my memory. And this isn’t unusual. In this article, I’ll explain how memories are contextual, how sound can cue memory, and the benefits of taking exams from home.