Around 1900 B.C., a student in the Sumerian city of Nippur, in what’s now Iraq, copied a multiplication table onto a clay tablet. Some 4,000 years later, that schoolwork survives, as do the student’s ...

While American children once learned to add by reading a poster of animals and birds, they do it now by playing games on computers. Each step in between—whether it be a box of blocks or exercises ...

War in Europe is a staple topic in the study of history, but there’s one major conflict most history books won’t teach you: the battle of the equal sign, =. These two parallel lines were, in fact, the ...