Social Media  Pi Day: Google Doodle Celebrates Math Nerds
Everywhere   For most of the world, today is March 14, or 3/14.
To most, that date doesn't have any special meaning. But to us
math nerds, it means only one thing: today is Pi Day!
Thankfully, it looks like Google has no shortage of number
nerds, because the search giant is marking the occasion with a
spiffy new logo filled with some of choice geometry formulas.  π
(Pi) is the mathematical constant that has helped school
children and mathematics professors determine the circumference
of a circle based on its diameter for centuries. The constant
starts with 3.14 and continues forever (as it is an irrational
number). Many math geeks celebrate the famous math constant (and
mathematics in general) on every 14th of March because that date
represents the first three digits of Pi.  Google's new logo,
which you can see on the top right, contains not only the famous
πr2 formula, but five other uses of π: measuring the volume of a
sphere (V = 4⁄3 πr3), computing