He says, she said, " 'Dad, if these are really holidays, how come we have to go to school?' " Out of all his math-themed calendar joy, he says Square Root Day comes along nine times each century, and ...

[MindYourDecisions] presents a Babylonian tablet dating back to around 1800 BC that shows that the hypotenuse of a unit square is the square root of two ... ancient Greek method written down ...