It is complete and utter nonsense to claim that "anyone who understands science knows there are no facts."  Science is loaded with facts.  Facts are usually represented by the data with which we deal when engaged in experimentation and observation.  Yes, rules and ideas are tested.  Theories are tested.  They are all tested against the data - the facts as we have gathered them.  It's a fact that people don't rocket off into space when they jump up from a trampoline.  Theories about gravity serve to explain that fact.  It's a fact that organic life on this planet is interrelated and evolved over billions of years.  The various theories of evolution explains that fact.  -