Jacob Bernoulli

Hello! My name is Jacob Bernoulli. I was born on January 6th, 1655, in the beautiful city of Basel, Switzerland. My father had a plan for my life: he wanted me to become a minister. To make him happy, I studied serious subjects like philosophy and theology at the university. But I held a secret in my heart. My true passion was for mathematics and astronomy! I studied them every chance I got. I even had a motto that I kept for myself: 'Invito patre sidera verso,' which is Latin for 'Against my father's will, I study the stars.'

After I finished my university studies in 1676, I knew I had to see more of the world. I set off on a grand tour of Europe, traveling for the next few years through France, England, and the Netherlands. It was a wonderful and exciting adventure for a young scholar like me. During my travels, I had the chance to meet many of the greatest scientific minds of my time, including a famous scientist named Robert Boyle. We would talk for hours, sharing our ideas and discoveries. This journey opened my eyes to all the incredible new things being discovered in science and math all across Europe.

In 1682, I returned home to Basel and began a new chapter of my life as a teacher. I loved sharing my knowledge with others. Just a few years later, in 1687, I was given a great honor: I became a professor of mathematics at the University of Basel. I was so proud to have turned my secret passion into my life's work. My younger brother, Johann, was also a brilliant mathematician, and we began working together. We were among the very first people to learn and use a powerful new kind of math called calculus. We loved solving difficult problems and challenging each other with puzzles, though I must admit that sometimes our brotherly competition could become a little too intense!

One of the ideas I am most remembered for involves probability—which is the mathematics of chance. I was fascinated with the idea of using numbers to predict what might happen. I wondered if we could figure out the chances of something happening not by magic, but with math! This led me to develop an important idea called the Law of Large Numbers. It sounds complicated, but it's really about patterns. It says that if you repeat a simple experiment, like flipping a coin, over and over again, the results will get closer and closer to the expected outcome. For a coin, that means you'll get heads about half the time. I wrote about this and many other ideas in my book, 'Ars Conjectandi,' which means 'The Art of Conjecturing.' It was published in 1713, after my life was over, but it helped create the foundation for the field of statistics we use today.

Besides numbers, I was completely captivated by a special shape called the logarithmic spiral. It has a magical quality: no matter how much you zoom in or out, the shape of the spiral always stays exactly the same. You can see this beautiful shape in nature, like in the curve of a seashell or the swirling arms of distant galaxies. I thought it was so perfect that I called it the 'Spira Mirabilis,' which means the 'marvelous spiral.' I found this shape so beautiful and meaningful that I requested it be carved on my tombstone to represent my life's work.

I lived to be 50 years old, passing away on August 16th, 1705. In a funny twist, the stone carver made a mistake and carved a different kind of spiral on my tombstone. But that's okay, because my true marvelous spiral and my ideas about numbers live on. The mathematical rules I discovered, like the Law of Large Numbers, are still used by scientists, engineers, and even weather forecasters every single day. I hope my story shows you that following your true passion, even if you have to do it in secret at first, can lead to the most wonderful discoveries.