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Understanding Science on experiments and other tests of scientific ideas.
NASA - Look inside a Deep Impact mission.
Louis Pasteur (1864) - An address delivered at the "Sorbonne Scientific Soiree," April 7, 1864.
Google - Research database allows searching of the scholarly literature.
A case study on Ernest Rutherford's experiments on atomic structure, from Understanding Science.
A case study on Alzheimer research that relies on experimentation.