He's studying physics.
Here's string theorist Luboš Motl, where I first saw the story:
...He's been reading approximately since his 2nd birthday. He knew the five basic mathematical operations – addition, subtraction, multiplication, division, and the Feynman path integral – a year later....I hate adults too.
...At any rate, 11 years is a wonderful age to start with quantum physics. I would guess that it's low enough age so that if you start to learn related physics insights at this age, you are more likely to avoid Bohmian, Everettian, GRWian, material collapsian, and other delusions denying some fundamental and universal postulates of quantum mechanics....
I feel old.
Previously:
16-year old Does Science Project, Finds Possible Cure for Cystic Fibrosis
What Did Your Kid Do Yesterday? "17-Year-Old Girl Wins $100,000 Award for Cancer Research"
10 Perfect ACT Scores From THE SAME HIGH SCHOOL