Fundamental
Physical Constants
Want to know the speed of light in a vacuum? This National Institute
of Science and Technology site can tell you that and more. Not a
site for elementary level science, it instead is a great visual resource
for upper level high school and college science students.
Perpetual
Motion Machine Page
Do you think you can make a machine that can run forever with a
self-generating form of power? For a century or more, men have been
making plans for perpetual machines. This site gives plans for four
perpetual motion machines and explanations for why each cannot really
work. A great place to stimulate the imagination and to search for
answers to one of science's greatest physical puzzles.