[SixOfSpades]

If a system can be enclosed, and then manipulated, and the results of that manipulation are predicted according to a theory, and it turns out that that prediction was correct, is it not logical to infer (after hundreds of tests) that the THEORY was correct?
In other words, if a population of fruit flies (some with normal wings, some with curled wings) is placed in a sealed case with food hanging from the ceiling, the theory of natural selection states that the flies with normal wings would thrive, and those with curled wings would eventually die out, even though both types are free to inter-mate and produce offspring, because those with curled wings have more difficulty in reaching the food. Actually performing this experiment shows this prediction to be valid, and therefore, the theory of Natural Selection is vindicated.
Natural Selection and Evolution are essentially one and the same: The difference is scale. Natural selection operates on the scale of the individual organism; Evolution operates on the scale of the entire species. And since we now know that changes in the environment provoke changes in organisms, and that our own environment is constantly changing, the logical conclusion is that we have been evolving ever since we existed.