One of Descartes' biggest ideas is called "mind-body dualism." 💭 This concept explains that our mind and body are different but connected. He believed that our thoughts, feelings, and consciousness are part of the mind, while our physical body is made of matter. When you have a fun thought or feeling, like joy or excitement, it happens in your mind, but it can affect how your body feels! Descartes' ideas have helped scientists and philosophers think about how our brain and body work together. 🤝