[crazychrome]

according to my understanding, there is no "fact" in science. there are observations, hypotheses (and null hypotheses if related to stats) and theories. i think "fact" is used in the article as theories or hypotheses that explain corresponding observations well enough, and over and over again.

[acqq]

Observation, if verified that it's done correctly, is a fact. Evolution is actually observed, so it's a fact.