Encyclopedia of Life
An emerging online reference and research tool that aims to document all the species known to humanity. The resource is being built by interactive contributions taken from Google Search, Wikipedia, and interested people. The site is overseen by experts editing the material.
National Institue of Standards and Technology (NIST)
CODATA Internationally recommended values of the Fundamental Physical Constants. Search for value by name (i.e. speed of light).
National Science Foundation
Research Areas divided into seven directorates that support science and engineering research and education.
Periodic -Web Elements
Complete table of elements, atomic weights, etc.
Science Reference Services
From the Library of Congress, contains “Science Tracer Bullets” with histories and bibliographies, along with Science Reference Guides, and Internet Resources covering many science and technology topics.
Search over 60 databases and over 2,200 scientific websites to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.
USGS Earthquake Information
United States Geological Survey latest earthquake information.