U.S. flag

An official website of the United States government

  • SciFinder Chemistry Database Class at the NIH Library

    Register to attend this class on SciFinder, a chemistry database that provides integrated access to a comprehensive collection of chemical substances, reactions, and literature references. 

  • NIH Celebrates Pi Day

    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).