San Jose, California: Jesse Roe, a ninth-grade math teacher at a charter school here called Summit, has a peephole into the brains of each of his 38 students. He can see that a girl sitting against ...

But, both of these would require large structural changes for a course that teaches hundreds of students a year — something that can’t really happen in the near term. What could happen now, though, is ...

Since its launch in 2011, Duolingo has become one of the most popular language teaching tools in the entire world, with over 500 million users learning to read and speak over 100 different languages.