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  Its a fact that people dont rocket off into space when they jump up from a trampoline  Theories about gravity serve to explain that fact  Its a fact that organic life on this planet is interrelated and evolved over billions of years  The various theories of evolution explains that fact