Wrinkles in the Brain

I had just told Kayla about how you can dry out grapes to make rasins, and she told me that she learned that when you learn something new, you get a wrinkle in your brain. I asked her if me telling her about grapes and rasins made a new wrinkle, and she said she had three. I was curious what three things she learned from that, and she said "I have one wrinkle for hula-hooping, one for jump-roping, and one for what I just told you."