I once heard it said that if you wait long enough sooner or later every fossil that is touted upon its discovery as another link in the chain of human evolution will be discredited. The discovery of the fossil is invariably front-page news, and its evolutionary significance is thoroughly explored, but its fall from favor, if it is reported at all, is consigned to the more obscure sections of the paper.
I thought of this when I came across this report about Australopithecus afarensis better known as "Lucy." Lucy was discovered in Ethiopia in 1974 by a team led by Donald Johanson and immediately hailed as an evolutionary common ancestor of the great apes and man. Now it turns out, thirty three years later, that researchers are doubtful that Lucy was ancestral to man at all.
An entire generation has been taught that Lucy was a missing link in human evolution. Now that the link to man seems to have been an illusion the perception still remains, like the grin of the Cheshire cat in Alice in Wonderland, that there is nevertheless much fossil evidence that humans evolved from ape-like ancestors. It may be that we indeed have a common ancestor with the apes, but the evidence in support of that hypothesis seems about as substantial as the cat's grin.
Don't look for this story to get nearly as much play in the media as did the account of Lucy's discovery and the excitement in the scientific community over the confirmation they thought it provided of the evolutionary model of man's descent. Evidence of evolution is news, the debunking of that evidence is not.
RLC