Here's how to remember a long list of things

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Let's say you have to pick up a bunch of groceries, but don't have your phone or even a pen and paper handy. Think about the house you grew up in, or any home/building that you know very well, and mentally walk a path in and around the place. Picture each item you need to buy at key spots along the path. For example, I use my parents' house:

Mailbox: visualize a box of Cheerios

Front door: bananas and milk (you can put more than one item, if they work together for you)

Piano stool in living room: roasting chicken

Living room couch: dozen eggs etc.

If you can think of the items "doing" something, like a milkman slipping on a banana peel, it makes a stronger memory.

When you get to the store, follow the path again in your mind, and you'll see each item right where you put it. The first time I tested this out, I was able to remember around 20 items along my path.

Even weeks later, I was surprised that the items were still there. You should go through and mentally "clean" the path before re-using it, because the path can get cluttered.

Even if you never use this for a practical purpose, it can be a fun parlor trick.