General Science:

• Exploratorium: An Online Museum of Physical and Life Sciences

• History of Science, Technology and Medicine

• Inventors Museum

• National Museum of Natural History, Smithsonian Institution

• The Nobel Prize & Laureates

• SciCentral: Gateway to the Best Science Directories

• Science Daily

• Science in the News Hotlist

Animals:

• BIOSIS: The Internet Resource Guide for Zoology

• BugBios

• EMBL Reptile Database

• Entomolgy Index of Internet Resources

• Fish FAQ

• Patuxent Wildlife Research Center

• Peterson Online

• The Raptor Center at University of Minnesota

• U.S. Fish and Wildlife Service

• Sea World / Busch Gardens Animal Information Database

Astronomy:

• Earth & Sky Radio Series

• The Nine Planets: a Multimedia Tour of the Solar System

• Planetary Science Research Discoveries

• A Space Library

• StarDate Online

• StarLore

• The U.S. Naval Observatory (USNO)

• Views of the Solar System

Biology:

• The Biology Project - an Online Interactive Resource for Learning Biology

• BioPoint Hotlist

• Cells Alive!

• Classification of Living Things

• General Biology: The Best Biology & Chemistry Resources

• Genetics Education Center

• Human Genome Profect Information

• The Tree of  Life: A Phylogenetic Navigator for the Internet

Botany:

• About.com Botany

• Garden Gate: Roots of Botanical Names

• Lady Bird Johnson Wildflower Center

• PLANTS National Database

Calendars and Time:

• The American Secular Calendar

• Calculation of the Ecclesiastical Calendar from AD 325 on

• Directorate of Time from the U.S. Naval Observatory

• Perpetual Calendar

• Sunrise/Sunset and Moonrise/Moonset Computations

• World Time Zones

Chemistry:

• The Catalyst: Chemistry Resources for the Secondary Education Teacher

• ChemCenter: A Service of the American Chemistry Society

• ChemEd: Chemistry Education Resources

• Material Safety Data Sheets on the Internet

• Unit Converter

• Web Elements - Periodic Tables

Dinosaurs:

• The Dinosauria

• UCMP Dinosaurs in Cyberspace: Dinolinks

• Discovering Dinosaurs

• Zoom Dinosaurs

Earth Sciences:

• Earth and Sky Home Page

• Earthquake Information from the U..S.G.S.

• Mineral and Gemstone Kingdom

• Ocean Planet Homepage

• Remarkable Ocean World

• Savage Earth Online: Earthquakes, Volcanoes and Tsunamis

• Volcano World

Ecology:

• About.com Ecology

• EcoNet Home Page

• EE-Link: Environmental Education Link

• EnviroLink: The Online Environmental Community

• IISDnet (International Institute for Sustainable Development)

Mathematics:

• Ask Dr. Math

• Calculators On-Line Center

• Dave's Math Reference Tables [in English & Espanol]

• Dictionary of Measures, Units & Conversions

• Math and Science Gateway

• Math Archives

• Math Forum: Selected Math Resources by Subject

• Math Homework Help

• Mathematics Information Servers

• Women Mathematicians

Meteorology:

• Meteorology: The Online Guide

• NOAA Home Page

• The Weather Channel

• Yahoo! Weather

Periodicals:

• Astronomy Magazine

• Astronomy Now Online

• Nature

• Popular Mechanics

• Popular Science

• ScienceNews.com

• Scientific American

• Sky & Telescope's Weekly News Bulletin

Physics:

• History of Physics from the American Institute of Physics

• Learn Physics Today

• Physics 2000

• PhysLink - Your Guide to Physics and Astronomy on the Web

Space Program:

• Basics of Space Flight

• Hubble Space Telescope Pictures

• Liftoff to Space Exploration

• The NASA Homepage

• NASA Kennedy Space Center

• NASA Human Spaceflight

• Project Galileo: Bringing Jupiter to Earth

• Shuttle Launch Countdown Home Page

• Space Flight History