Morning has broken in the 4th-grade, class 6 classroom at Yongin Seonong Elementary School. Students gather in small groups. As the 4th graders arrive, the first thing they place on their desks are ...

Corrected: An earlier version of this story incorrectly stated the number of registered users of the Khan Academy. It is 137 million users. A bevy of technology and software tools are taking center ...