This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to ...

Known around the world as "Pi Day," it’s a time to celebrate one of mathematics' most famous constants: Pi, the ratio of a circle's circumference to its diameter, approximately 3.1415.

Constants in mathematics include the force of gravity, Pi, speed of light and the golden ratio. In the art and science of management, the constants are an ability to adjust, and agile habits.