Science
Albert Einstein
Animals
Big Numbers, Way beyond Giga..
Bottom of the World
Centigrade and Celcius
Earth
Ecology
Hawking
Nanotechnology
Nuclear Resources
Physics
Robotics
Science Fiction Favorite Yoda
Skyscrapers
Space
UFO
Weather

Science and Engineering working together:
Engineering Sights (a special web showcasing engineering from the NSPE and National Engineers Week organizations)

Science Resources:
Science Museum
Smithsonian Institution
Chicago Institute of Science and Technology
NIST: Celebrating 100 years of Standards
Tele Robotics
Science Master
National Academies-Sciences in Focus
Harcourt Dictionary of Science and Technology
Brain Drops from Franklin Institute
Global Technology Revolution
Harvard's " Research Matters"Portal
Journal of the National Academy of Science
National Geographic
A website to report mistakes in Middle School Science Textbooks
Proceedings of the National Academy of Sciences
Science introduced to children:  Try Science