The women of Iceland earn two-thirds of their nation's university degrees. More than half of Indonesia's primary school teachers are under 30years of age . Teachers in China are highly respected. They hardly ever leave the profession and are...

The constant is called "?" because "?" is the first letter of the Greek words ?????????? (periphery) and ?????????? (perimeter), probably referring to its use in the formula to find the circumference, or perimeter, of a circle. In 1737, Euler used...