Giambattista della Porta was a man who lived a long time ago in Italy, hundreds of years ago. He was very smart and curious, and he wanted to learn about all kinds of things in the world. He studied science, math, and other subjects and wrote many books about what he learned.
One thing Giambattista della Porta is famous for is his work with lenses. Lenses are the things in glasses or magnifying glasses that make things look bigger. Giambattista della Porta studied how lenses work and he made some of the very first telescopes and microscopes!
He also invented other things, like a kind of machine that could copy letters and a way to make fireworks. He really liked playing with different substances and trying to make new things with them.
Giambattista della Porta was a very curious person and he liked to explore and learn about the world around him. He wanted to share what he learned with others, so he wrote many books to teach people about science, math, and other subjects. Even today, many people are still inspired by his love of learning and his curiosity about the world.