NASA Solar System Exploration
The Sky this Week
Space.com
Astronomy Picture of the Day

Chemistry:

Advanced Placement Virtual Library
Web Elements

Geology:

Igneous Rocks
Metamorphic Rocks
Sedimentary Rocks
United States Geological Survey

Physics:

Physics Central
PhysLink

Museums and Science Centers:

River Legacy Living Science Center
Botanical Research Institute of Texas
Dallas Museum of Natural History
Fort Worth Museum of Science and History

 

All Science Fair Projects
Science Buddies
Science Fair Central
Science Fair Project Resource Guide
Yes Mag

General Science:

Mad Sci Network
National Science Foundation
Science.gov
The Why Files

Insect Guides:

Butterflies of North America
Common Insects of Texas
Insects on the Web

Plant Guides:

Native Plants Database
Wildflowers in Bloom

Wildlife:

eNature
North American Mammals
 

Academic Search Complete
Computer Source
Information Science & Technology Abstracts
Internet & Personal Computing Abstracts
MasterFILE Premier
Science & Technology Collection
New! Small Engine Repair Reference Center

Search the Library Catalog for:

Astronomy--Observers' Manuals
Experiments
Geology

Technology:

FreeTechBooks.com
Download.com
GrayLIT Network: A Science Portal of Technical Reports
How Stuff Works
MachineBrain
TechEncyclopedia
This Week in Tech (podcast)