Point to your brain. It is the soft, wrinkly body part inside your head, about the size of two fists. But your mind is something a little different, and philosophers love to think about how.

Your mind is where your thoughts, feelings, and imagination live. When you picture a purple elephant, feel excited about a birthday, or solve a riddle, that is your mind at work.

Your brain is like the machine, and your mind is like everything the machine helps you experience. A brain is a body part you could point to, but you cannot point to a thought floating in the air.

Here is what puzzles philosophers: nobody can open up a brain and see a memory or a feeling inside it. Your love for your family is real, but it is not a lump you could hold in your hand.

Most scientists think the brain makes the mind possible, the way a piano makes music possible. The piano is the wooden object, but the song is something you hear and feel.

Wondering how a squishy brain can create your whole inner world of ideas and dreams is one of the biggest questions there is. Even grown-up scientists are still trying to figure it out.