Johann Helfrich von Müller was a person who lived a long time ago in a place called Germany. He was born in the year 1746 and he died when he was 82 years old. That is a very long time to live!
He was an important person because he was a doctor who knew a lot about the human body and how it works. He wrote many books and taught other people about medicine so they could help sick people too.
Johann Helfrich von Müller was also very interested in plants and animals. He studied them and learned about their different parts and how they work. He even discovered new species of plants and animals that had never been seen before!
People who knew him said he was a very kind and generous person who loved helping others. He was also very smart and curious, which means he was always asking questions and trying to learn new things.
In summary, Johann Helfrich von Müller was a very important person who was good at healing people and understanding plants and animals. He lived a long time ago in Germany and was very kind and smart.