The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
Standard Reference Materials are certified reference materials (CRMs) that can be used to help develop accurate methods of analysis, to calibrate measurement systems used to measure a property at the state-of-the-art limit.
Standard Reference Data cover a broad range of scientific disciplines including atomic and molecular physics, chemical and crystal structures, fluids, material properties, biotechnology, optical character recognition and more. Data products include web applications, personal computer products, site licenses, subscriptions and distributor agreements. The SRD data program includes the Journal of Physical and Chemical Reference Data.
If you’ve ever tried to set up a home entertainment system by poring over a thick manual, you might appreciate the manufacturer also providing you with a quick
Taking another step toward strengthening the nation’s critical infrastructure, the National Institute of Standards and Technology (NIST) has drafted guidelines
The social and economic impacts of COVID-19 have battered small and medium-sized enterprises, putting millions of jobs in the U.S. at risk. And a year rife with
Researchers at the National Institute of Standards and Technology (NIST) and the University of Maryland have developed a microchip technology that can convert