John Dalton

Hello! My name is John Dalton, and I want to tell you my story. I was born on September 6th, 1766, in a small English village called Eaglesfield. My family were Quakers, a group of people who believe in living simply and peacefully. I was a very curious child and loved learning about the world around me, especially the weather! I was so eager to learn and teach that by the time I was just 12 years old, in 1778, I started my own school.

In 1793, I moved to the big, busy city of Manchester to teach math and science at a college. Every single day, I would look outside and write down what I saw. I kept a detailed weather journal from 1787 until the end of my life, with over 200,000 notes about the rain, wind, and clouds! Around this time, I also made a curious discovery about myself and my brother, Jonathan. We couldn't see colors the same way other people did. In 1794, I became the first person to write a scientific paper about this condition, which many people later called 'Daltonism' in my honor.

My studies of the weather and the air got me thinking. What was everything really made of? I spent years doing experiments, especially with gases. Around 1803, I had a huge idea! I realized that all things—the air we breathe, the water we drink, even you and I—are made of tiny, invisible particles I called 'atoms'. I imagined them like tiny, solid balls. I figured that atoms of one element, like gold, are all exactly alike, but they are different from the atoms of another element, like oxygen. And when these atoms link together, they make up everything we see. I published these ideas in my book, 'A New System of Chemical Philosophy,' starting in 1808.

My atomic theory was a very big deal, and scientists were very excited about it. I was honored to be elected to the famous Royal Society of London in 1822. I lived a long and happy life filled with curiosity and discovery, reaching the age of 77. Though my life ended, my ideas live on. Today, I am remembered for giving science the atomic theory, which is the foundation of modern chemistry. Every time you learn about atoms in science class, you are seeing a little piece of the world that I helped everyone to understand.