TBT
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Did you know that the formal scientific definition of theory is quite different from the everyday meaning of the word. It refers to a comprehensive explanation of some aspect of nature that is supported by a vast body of evidence.
Many scientific theories are so well-established that no new evidence is likely to alter them substantially. For example, no new evidence will demonstrate that the Earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory).
The theory of evolution is supported by so many observations and confirming experiments that scientists are confident that the basic components of the theory will not be overturned by new evidence.
Remember gravity is also a theory.
http://www.nas.edu/evolution/TheoryOrFact.html
Gravity is a theory?
Well..... that's the first time that I've had a theory kick my *kitten*.0
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