For young math phenom, age is just another number

Mila Koumpilova:

In his first algebra class last year, Mani Chadaga slumped low in his front-row seat and pretended to read his new textbook intently.
Mani could make himself only so inconspicuous: He was, after all, a second-grader in a junior high class at St. Paul’s Capitol Hill Gifted and Talented Magnet School.
So he stopped trying.
Soon, he was piping up with solutions to the teacher’s questions and standing before his stumped classmates, explaining how he arrived at them. These days, as a third-grader juggling Algebra II and geometry, he kneels in his seat, only a smidgen of his early shyness and all his humility intact.