Jang Yeong-sil

Hello! My name is Jang Yeong-sil. I lived a very long time ago in a kingdom called Joseon, which is now known as Korea. When I was a boy, around the year 1400, I didn't go to a fancy school. I came from a simple family, but I loved to figure out how things worked. I would spend my days watching wheels turn, water flow, and stars move across the night sky. I was always building and fixing things, dreaming of creating amazing machines that could help people.

In my time, it was unusual for someone like me to work in the king's palace. But the ruler of our land, the great King Sejong, was very wise. He heard about my skills and believed that talent was more important than where someone came from. Around the year 1421, he invited me to his palace in the capital city, Hanseong! He asked me to become a royal scientist and use my ideas to help our kingdom. I was so excited to have the chance to make my dreams come true.

King Sejong gave me the tools and space I needed to invent. One of my favorite creations was a fantastic water clock I built in 1434 called the Jagyeongnu. It was huge! Water would drip from one pot to another, and when the time was right, little puppets would pop out to ring bells and bang on drums. It told everyone in the palace the correct time, day and night! I also helped create the world's first rain gauge in 1441. It was a simple metal pot that measured how much rain fell. This was very important because it helped farmers know when to plant their crops.

I worked for the king for many years. But one day in 1442, a special carriage I designed for him had an accident. I was blamed for the problem and had to leave my work at the palace. It was a very sad day for me, as I loved my job more than anything.

Even though my time as a royal scientist came to an end, the inventions I created were used by the people of Korea for hundreds of years. The clocks helped people keep time, and the rain gauges helped them grow food. I lived a full life, and today, I am remembered as an inventor who showed that with curiosity and hard work, anyone can create things that change the world.