"67," pronounced "six seven," spread from a rap song, through sports and social media, to classrooms and homes across the U.S. But even the artist who coined it struggles to define it.

“When I use a word,” one of 19th century British author and mathematician Lewis Carroll’s characters once said, “it means just what I choose it to mean — neither more nor less.” Though he was a ...

Dyslexia, a neurobiological condition that affects how individuals read and spell, has come into the spotlight in K-12 ...