The seventh-grade students are playing a round-robin trivia game, excitedly naming the countries on a blank map showing on their classroom's overhead projector. Burkina Faso. Cote d'Ivoire.
Faster and faster, the teacher goes around the room until it's just Justyn and another boy.
The tallest mountain in Africa? Mount Kilimanjaro. The tallest mountain range in South America? The Andes.
And then it's over. Justyn doesn't win the game but he's still smiling, showing off the deep dimples in his cheeks. His 25 classmates erupt into cheers, applauding both students.
This is how it works at the extraordinary Ron Clark Academy, a private middle school tucked among boarded-up houses and graffiti-peppered walls in Lakewood, one of Atlanta's poorest neighborhoods.