We are excited to announce a preview of the new NIH Library website. We have been redesigning the website as part of our ongoing work to improve your access to the Library’s information resources and services.
The Greek letter π is the symbol for the irrational number representing the ratio of the circumference of a circle to its diameter. It is approximately 3.1415926. Pi Day is an annual celebration on March 14th (3/14), with this year’s being a very special Pi Day (3/14/15).