Math enthusiasts know all about it, and the rest of the population is probably hoping for cherry pie.
A few more tidbits about pi and Pi Day:
-- Pi is the ratio of the circumference of a circle to its diameter. It's not equal to the ratio of any two whole numbers, so an approximation -- 22/7 -- is used in many calculations.
-- Pi is essential in architecture and construction and was used frequently by early astronomers.
-- Pi has been known for about 4,000 years, but it started to be called by the Greek letter only in the 1700s.
-- There are no occurrences of the sequence 123456 in the first million digits of pi .
-- The true "randomness" of pi's digits -- 3.14 and so on -- has never been proven.
-- Pi Day started 28 years ago at San Francisco's Exploratorium. Physicist Larry Shaw, who worked in the electronics group at the museum, started celebrating pi on March 14, 1988, primarily with museum staffers. The tradition has grown to embrace math enthusiasts from all walks of life.
Visit pi day
-- March 14 also happens to be Albert Einstein's birthday.
There are 5 houses in five different colors.
In each house lives a person with a different nationality.
These five owners drink a certain type of beverage, smoke a certain brand of cigar and keep a certain pet.
No owners have the same pet, smoke the same brand of cigar or drink the same beverage.
The question is: Who owns the fish?
the Brit lives in the red house
the Swede keeps dogs as pets
the Dane drinks tea
the green house is on the left of the white house
the green house's owner drinks coffee
the person who smokes Pall Mall rears birds
the owner of the yellow house smokes Dunhill
the man living in the center house drinks milk
the Norwegian lives in the first house
the man who smokes blends lives next to the one who keeps cats
the man who keeps horses lives next to the man who smokes Dunhill
the owner who smokes BlueMaster drinks beer
the German smokes Prince
the Norwegian lives next to the blue house
the man who smokes blend has a neighbor who drinks water
Einstein wrote this riddle this century. He said that 98% of the world could not solve it.
Pi or Pie Recipes:
Lemon Meringue Pie
Basic Pie Dough for Cherry Pie
Source for the Puzzle
See also: Remembering Einstein, 138 years after his birthThe Jewish Telegraphic Agency recalls an interview with the physicist in 1926, when he mused about anti-Semitism JTA Interview with Einstein