Ning Li is a really smart person who studies things called molecules and atoms. Molecules and atoms are tiny things that you can't see with just your eyes.
Ning Li studies how these tiny things move and behave. She uses something called quantum mechanics, which is a big word that means studying the behavior of really small things.
Ning Li also studies something called superconductivity. This is like when electricity can move through things very easily without getting stopped. It's kind of like a car that can keep going even if there are a lot of things in the way.
Overall, Ning Li is working to help us understand how these tiny things work, which can help us with a lot of different things like making better computers or improving the way we use electricity.