I think part of Wikipedia is defining what a term means many words are used in many different ways I remember ethnic group being a pretty vague term before Wikipedia was around Everyone uses the word evolution in a different way I don t believe in correct definitions so much as consistent and useful ones I propose we adopt the following Evolution Umbrella term any change over time as stated in first sentence of article Natural selection horizontal gene transfer etc Mechanisms which explain evolution the observation Theories of evolution A theory to explain one particular facet of evolution in terms of natural history e g Out of Africa Theory Cretaceous Paleogene extinction event The other problem with this article is that many scientists were motivated by a desire to explain why livings things are adapted to their environment or to explain the diversity of life As opposed to Evolution per se The Precambrian rabbit wouldn t falsify Evolution so much as discredit all of our current theories about Evolution What do we think