So Alexander Zamolodchikov is a really smart person who studies things called physics and math. He likes to figure out how things work, just like how you like putting together legos to see how they fit together.
But instead of legos, Alexander Zamolodchikov likes to study things called quantum field theories. These are big and complicated ideas about how tiny things like particles interact with each other.
One thing that Alexander Zamolodchikov figured out is something called the Zamolodchikov C-Theorem. It's like a rule that helps people understand how particles move and change when they are interacting with each other. It's kind of like how you can make a rule that says you have to follow a certain order when building with legos so things don't fall apart.
Because Alexander Zamolodchikov was able to come up with this rule, it helps other scientists understand quantum field theories better. And they can use that knowledge to find new things they didn't know before!