Eric Weisstein’s World of Science

Encyclopedias of astronomy, scientific biography, chemistry, math, and physics.

HighWire Press – Free Online Full-text Articles

Archive of free full-text science.

How Stuff Works

Research how things work.

NASA

Images, videos and interactive features from the U.S. space agency.

NOAA’s National Weather Service

U.S. and state weather, international weather, and radar.

Science Daily

Science, technology and medicine.

Science Reference Services

Bibliographies and research guides from the Library of Congress.

Science.gov

U.S. government science organizations that provide access to science databases and web pages.

U.S. Climate Normals

Detailed climate reports and weather statistics from 1971 to 2000.

United States Geological Survey

Scientific information to describe and understand the Earth.

WebElements: The Periodic Table on the World Wide Web

Information on any element of the Periodic Table.