Cells

Imagine a world so tiny you can’t see it. I live there. I am inside the wiggle of a worm, the petal of a bright yellow sunflower, and the tip of your nose. I am a super tiny worker, and there are trillions of me inside you. We all work together as a giant team to help you run, jump, think, and grow. We help your heart beat and your brain have amazing ideas. We are in your hair, your tummy, and even your little toe. But even if you look very, very closely, you can’t see me with just your eyes. I am a secret building block that makes up every living thing. What am I? I am a Cell.

For thousands of years, nobody knew I existed. I was a secret hidden from everyone. People saw big trees and tiny ants, but they had no idea what they were made of. That all changed in the 1600s when a wonderful invention came along: the microscope. It was like having superhero eyes that could see the tiniest things. In the year 1665, a curious scientist from England named Robert Hooke looked at a thin slice of cork from a plant. He saw that it was full of what looked like little empty rooms. They reminded him of the small rooms, or cells, where monks lived, so that’s what he named me. A few years later, in the 1670s, a man named Antonie van Leeuwenhoek built his own special microscopes. He looked at a single drop of pond water and was amazed to see my little cousins swimming and wiggling around. It took many more years, but in the 1830s, two scientists named Matthias Schleiden and Theodor Schwann finally announced a big idea. They realized that all living things—every plant and every animal—were made of cells like me. They called it the Cell Theory, and my secret was finally out.

Now you know that I’m not just one thing; I am part of your own personal team. Every single one of us has a special job to do. Some of my brothers and sisters are muscle cells that help you kick a ball. Others are brain cells that help you learn new things at school. When you get a scrape on your knee, a whole crew of us rushes over to build new skin and heal you right up. We are the reason you grow bigger and stronger every single year. You have a giant, amazing team of trillions of cells working together every moment of the day. All of us work together to make you healthy, strong, and the wonderful person you are. We are so happy to be your team.