Eli5 Why does having a brain with more wrinkles make you smarter?

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I’ve heard it explained as a density problem but that doesn’t make sense too me either because then wouldn’t having a smooth brain mean it’s more solid?

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Imagine having a big room with bookshelves along the walls. You probably have a lot of books with information you need. Now, imagine adding bookshelves that stick out, make a maze throughout the room with different sections for more books. Now, you have a lot more information to read and more books that might relate to each other so you can learn things in more depth.

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