A Google search reveals that Lithuania is a possible source.

When I was in high school, most of the kids who really "got" math were the black kids bussed in from Detroit; they'd sit in the front row and correct the teacher if she got something wrong, and offer simple ways to solve problems which she presented as terrifyingly complex. The white kids (including me) hung out in the back of the classroom and played Tetris on their super-expensive graphing calculators. Good times.