How is Evolution a fact?

In the article "Evolution is a fact and a theory" it states that evolution is a fact. The article is here Evolution is a Fact and a TheoryHowever I am a little confused, because by scentific definition evolution cannot be a fact."In science a fact is an objective and verifiable observation, in contrast with a theory, which is a explanation of or interpretation of facts." -wikipediaLike gravity, evolution is not something you can directly observe. You can observe the effects of the theories on certain objects, but not the theories themselves. Of course both theories are very credible, and I can be about 99% sure they are true, however it's a little confusing as to how evolution can be a fact.It states in the article:
"There are some readers who are not anti-evolutionist but still claim that evolution is "only" a theory which can't be proven. This group needs to distinguish between the fact that evolution occurs and the theory of the mechanism of evolution." -Laurence MoranI understand that there are two parts to evolution, however if you consider evolution as a fact, "the fact of evolution" would need other facts to back it up. And to my understanding facts shouldn't need other facts to prove it. I dunno though maybe my definition of fact is different from the scientific community. What do you all think?

I'd like to promote this topic but it isn't ready for promotion just yet, I'll make a post explaining what needs to be put in the OP to get it promoted (by me at least) in a moment.

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Thread copied to the How is Evolution a fact? thread in the Biological Evolution forum, this copy of the thread has been closed.