John Dalton

Hello! My name is John Dalton. I was born a long, long time ago, on September 6th, 1766, in a small village in England. Even as a little boy, I was full of questions. I was especially curious about the weather. I would look at the clouds and wonder why it rained. I loved learning so much that when I was just 12 years old, I started my own school to teach other children. I believed that if you looked closely at the world, you could figure out its secrets.

As I grew up, I became a teacher in a big city called Manchester. I noticed something curious about myself and my brother, Jonathan. We didn't see colors the same way other people did. A red flower might look gray or yellow to us. Instead of just shrugging, I wanted to know why. In 1794, I wrote down all my ideas about it. It was the first time anyone had ever studied what we now call color blindness. It was proof that asking questions could lead to new discoveries.

My biggest questions were about what everything was made of. What makes a rock a rock, and water water? Around the year 1803, I had a giant idea. I imagined that everything in the whole world—the chair you're sitting on, the air you breathe, and even you—is made of teeny, tiny building blocks. These blocks are so small you can't see them. I called them 'atoms.' I thought that different things were made of different kinds of atoms, like how you can build different things with different toy blocks. A water atom was different from an air atom. This simple idea changed how everyone thought about the world.

I spent the rest of my life as a scientist, always asking questions and looking for answers. I lived to be 77 years old. My idea about atoms was just the beginning, and it helped other scientists make amazing discoveries that are still important today. Every time someone studies science and learns how things are put together, they are using ideas that started in my curious mind. So always remember to ask questions—you never know what secrets you might unlock!