Originally defined as the ratio between the circumference of a circle and its diameter, pi — written as the Greek letter π — appears throughout mathematics, including in areas that are completely ...

Along the left side of a cold, gray cement building on Alcatraz Island, hundreds of colorful NFL jerseys suspended on clothesline hang limp in the cold air. The building is about as long as a football ...

The ancient Greeks wanted to believe that the universe could be described in its entirety using only whole numbers and the ratios between them — fractions, or what we now call rational numbers. But ...