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| | WHAT IS A THEORY? (Site not responding. Last check: 2007-10-16) |
 | | Thus we have Newton's theory of gravity and the motion of planets, Einstein's theory of relativity, the germ theory of disease, the cell theory of organisms, plate tectonics (theory of the motion of land masses), the valence theory of chemical compounds, and theories of evolution in biology, geology, and astronomy. |
 | | Yes, a scientific theory can be wrong, as shown by experiment or observation, since one of its hypotheses might be wrong or the reasoning might be flawed or new data might come along that disagree with it. |
 | | This has happened, for example, in physics with the caloric theory of heat and the theory of the luminiferous ether, and in chemistry with the phlogiston theory of combustion. |
| www.nebscience.org /theory.html (505 words) |
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