Many of us who dreamed to become a scientist when we were small. When our curiosity were at the peak, and we when we loved asking questions, the grown-ups will encourage us to become a scientist when we grow up. There are many different kinds of scientists, and they all do different things. Some like to learn about living organisms. They are called biologists. Others like to study rocks. We call them geologists. People who study animals are sometimes called zoologists - this is easy to remember because sometimes animals live in zoos. Scientists are very curious people who like to solve problems. They solve these problems by doing science projects called experiments. What are some of these problems? Well, they can be about keeping our air clean or finding a way to cure people when they have certain diseases.