<i>You can never prove a scientific theory, you can only disprove it. You can confirm a theory a million times but that does not imply that it will work the next time. It does however give us some amount of confidence that it will.</i><p>Your definition of "prove" is too narrow. From my online WordWeb dictionary:<p><i>Verb: prove (proved,proven)
1. Be shown or be found to be
2. Establish the validity of something, as by an example, explanation or experiment
3. Provide evidence for
4. Prove formally; demonstrate by a mathematical, formal proof
5. Put to the test, as for its quality, or give experimental use to
...etc...</i><p>Many senses of this word relate to subjecting something to a test, rather than proof in the mathematical sense.