Why do we forget even important memories over time?

We forget even important memories over time because our brain needs help to keep them fresh.

Imagine your brain is like a big toy box full of memories, each one is a special toy you played with. When you first get a new toy, it's shiny and exciting, and you remember playing with it all the time. But as days go by, if you don’t play with that toy again, it starts to gather dust.

If you don't use your brain often, or if you're busy with new toys (like learning new things), the older ones get pushed aside. It's like when you have too many toys in your box, you can’t find the one you want because everything is mixed up.

Sometimes, even if you remember playing with a toy before, it feels fuzzy or not quite right, just like how a picture might look blurry if it’s not cleaned properly.

So, when we forget important memories, it's not because they're gone, it's more like they're hiding under the pile of new toys in your brain's toy box.