I recently came across a quite interesting story. There was a mathematician named Grigorij Perelman, born in Leningrad in 1966. He did something crazy—proving the Poincaré Conjecture, which had puzzled the math world for nearly a century. Even crazier, after he finished the proof, he completely disappeared.

First, let’s talk about what this conjecture is. In simple terms, the Poincaré Conjecture involves the topological properties of three-dimensional spaces. Imagine a three-dimensional, closed, hole-free space; topologically, it’s equivalent to a three-dimensional sphere. In other words, if a 3D space has no holes, then it’s essentially a sphere. If it has holes, it’s different—like a donut or a tire. This sounds simple, but rigorously proving it took mathematicians over 100 years.

How did Perelman do it? He didn’t hold press conferences or give speeches like other scientists. Between 2002 and 2003, he directly posted his paper on arXiv, an open preprint server used by mathematicians. That’s how his proof was out there, allowing mathematicians worldwide to verify it themselves. The whole process was almost without media promotion—pure academic work.

Verification took several years because the proof was extremely complex. Perelman used Ricci flow and geometric topology methods, which are not easy to understand. But in the end, the math community confirmed—this guy indeed solved one of the seven Millennium Prize Problems.

In 2006, Perelman received the Fields Medal. In 2010, he also won the $1 million prize from the Clay Mathematics Institute. And then? He rejected it all. No awards, no money—he refused everything.

Now, here’s the even more interesting part. Perelman probably left academia around 2005 to 2006. He no longer attended conferences, published new papers, or worked at a university. Now he lives a highly reclusive life in Saint Petersburg. Few people have seen him on the street. Media have shot videos of him in supermarkets, buying cheap ingredients, paying in cash. He’s unmarried, has no children, and reportedly lives with his mother in a regular apartment in Petersburg.

Why did he do this? Perelman once said he was disappointed with the organization of the mathematical community and had no interest in fame or wealth. There’s a famous saying that he reportedly said something like, “Why do I need these awards and money when I know how to manage the world?” That sounds both arrogant and honest, reflecting his deep criticism of the academic system.

So now you understand—Grigorij Perelman is the kind of person who truly solves problems just for the sake of solving them. He doesn’t need the spotlight, recognition, or money. He proved a century-old difficult problem and then stepped away from the stage. This is almost unimaginable in modern science. Most people would promote their achievements widely, but Perelman simply didn’t. His extreme independence and indifference to material things made him a legendary figure—not because he was highly successful, but because he chose complete seclusion after success.