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Biology
Ask a Scientist
Chemistry
A Level Chemistry, BBC GCSE Bitesize Revision, Chemical Elements.com, S - Cool Chemistry revision
Physics
Crashwhite.com, How Things Work, The Physics Help Page
Weather
Ask A Hurricane Hunter, Weather Watch: Hurricanes
8th Grade Integrated Science Sci-Ber Text
Offers tutorials that allow children to explore topics such as matter, energy, forces, machines, and the Earth. Includes pictures, fun activities, experiments, and movies.
Ask a Student Scientist
Interactive question posting with answers from a student scientist.
Basic Science for Kids
Contains science projects and experiments for kids, along with detailed answers to science questions and unit conversions.
BJ Pinchbeck Offers Science Homework Help
Organized collection of links to help students find the information they need.
MadSciNet: The 24-Hour Exploding Laboratory
Utilize a random knowledge generator and find out what's cooking up in a Mad Scientists' section.
Science Quiz Activities and Games
Collection of interactive quizzes for students in grades 5-9.
ScienceBob.com
Enter the world of Science Bob to try home experiments, visit his online lab, and get answers to general science questions.
The Last Word
New Scientist offers simple answers to everyday physics questions such as why tin foil hurts teeth and why remote control locks won't work in some parking lots.