More NIST Web Links
Find out what
it really is.
Walk Through Time
an illustrated history of timekeeping.
See historical exhibits relating to
time and frequency
Learn more about the
, also called the International System of Units (SI).
Interested in physics? Find out about
fundamental physical constants
, which features an exhibit on the history of weights and measures.
Find out how NIST helps protect America's
Charters of Freedom
the Declaration of Independence, the Constitution, and the Bill of Rights.
Learn about Marie Curie and the
NIST (NBS) Radium Standards
Check out the guide to
NIST educational activities
Created: May 10, 2001
Last updated: August 15, 2001