Oh, this is what I get for not reading the whole thread carefully before posting! Sorry, all!

Dave, thank you for your "usually" comment (*blush*), but I stand by my definitions:
I said "evolution is a theory, but so is gravity, the planet being round, the planet going around the sun, and a lot of other things that are undeniably, one would wish, true." You said "Wrong! Evolution is an observed set of facts. There are theories which set out to explain it, the most famous and most generally accepted of which is Darwin's. " - sorry, charlie/Dave - nobody observes gravity. You observe its effect; it is a theory. And nobody observes evolution, but evolutionary theory is the best explanation for life as we know it (through science at least.) The problem is, I think, that we (humans, especially anglophones) tend to confuse Jargon and English. In a parallel example, a "soldier" is a person in the Armed Forces, but call a Marine a soldier and you will be corrected. In English, marines, army folks, navy folks and air force folks are all soldiers. In the military, that isn't the case. So when discussing things military, one uses Soldier to mean Member of the branch of the armed forces that is called the Army. By the same token, in science, a theory is that which explains testable hypotheses; in English, it's an idea. Our discourse being about science, it was OK that I used the jargon term, but jargon should always be footnoted as jargon. Gravity, in that universe, is a theory; the observed fact is that you don't fall up. The testable hypothesis, which is fun to do with helium balloons and very small children, is that if you let go of something, it will fall towards your planet.