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How Do We Know:

• The Earth Revolves
• Atoms Exist
• Fossils are Old
• Distance to Stars
• The Earth Rotates
• The Earth is Round
• The Distance to the Sun
• The Speed of Light
• What Stars Are Made Of
• The Universe is Expanding

Fun Stuff:

• The Mandelbrot Set: An Introduction
• The Area of a Circle

There are many resources that are available on the 'net to explore the findings of science. Here are a few favorites of mine:

• Hyperphysics
• HowStuffWorks

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Dr. Science