Science & Technology
Chemical Elements.com
Online periodic table of elements.
Cosmic Evolution
This site traces the cosmic origin and evolution of all matter and energy starting with the Big Bang.
Doing Science : an Introduction to Physical Science
Electronics Tutorials
"Offering free comprehensive basic electronics tutorials in amplifiers, antennas, ham radio, filters, oscillators, power supply, receivers, test equipment, transmitters, radio design and electronics design. Links to data sheets and electronics reference and text books."
Electronics Plus
This site is dedicated to the electronic hobbyist. It provides monthly projects that are easy to build, allowing you to learn the basic principles of electronics.
How Stuff Works
This site explains the mechanics of everyday things.
National Inventors Hall of Fame
Provides information inventions and inventors, including biographies and pictures. Searchable.
National Oceanic and Atmospheric Administration (NOAA)
This government agency provides access to a variety of informational resources, including charting and navigation (such as nautical charts and coastal survey maps), climate, coasts, fisheries, oceans, and weather.
SciCentral
This directory provides access to several links. The index divides the links into the following categories: Physical and Chemical Sciences, Earth and Space Sciences, Biological Sciences, Health Sciences, Engineering Sciences, etc. The K-12 Science section is particularly noteworthy.
Scientific American: Ask the Experts
Check out the interesting questions people submit to the scientific experts at Scientific American. Previous questions are arranged by topic.
SciTechResources.gov
"This web site locates thousands of U.S. Government science and technology resources on the web that let you tap into government expertise, services, facilities, and know-how."
SimScience
"A web site devoted to areas of science where computer simulations are at the forefront of discovery." The site uses computer simulations to explain fluid flows, surfaces and membranes, why a dam cracks, and what is a crackling noise.
US Naval Observatory Data Services
The Astronomical Applications Department of the U.S. Naval Observatory computes, from fundamental astronomical reference data, the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena.