Artifacts- An Enigma

"Knowledge rests not upon truth alone, but upon error also" Literal meaning of artefact given by "Oxford Advanced Learner Dictionary" is a "thing made by people". In medical science the "fact" is not true; but we observe routinely is called artefact. An artefact (L. ars-art + factum-made) in histology means any non-natural feature or structure accidentally introduced into something being observed or studied.