Okay kiddo, let me explain what a stem cell is.
Have you ever heard the word "cell"? Cells are tiny things that make up all living things such as plants and animals, including you and me!
A stem cell is a special kind of cell that can grow into many different types of cells in our body. It's like a superhero cell!
So, let's say you have a cut on your finger. Your body needs new skin cells to grow so the cut can heal. That's where the stem cells come in! They can change into new skin cells and help your cut heal.
Not only can stem cells help with cuts, but they can also help with other medical problems like helping people who have leukemia (a type of cancer).
Scientists study stem cells so they can learn more about how they work and how they can help people.
Isn't that cool, little one? Stem cells are like magical building blocks that can turn into different things to help us stay healthy!