New York schools chancellor Joel Klein often speaks eloquently about the harm that the education system’s inability to dismiss incompetent teachers does to children. He’s right about that, of course.

Bob Moses became famous as one of the chief organizers of the Freedom Summer of 1964, when hundreds of college students invaded Mississippi to fight nonviolently for civil rights. But Moses was also a ...

An equation with brackets must be expanded before it is solved. An understanding of expanding brackets is essential when solving equations with brackets. Some equations include a set of brackets. When ...

This jingle has helped generations of algebra students recall the quadratic formula that solves every equation of the form $latex ax^2+bx+c=0$. The formula is as ...

Bob Moses became famous as one of the chief organizers of the Freedom Summer of 1964, when hundreds of college students invaded Mississippi to fight nonviolently for civil rights. But Moses was also a ...