TRiG, Are you saying there is only one "valid theory?" I mean my Science Desk Reference states the following:

The theory is a general statement that explains the facts. A theory can lead to a new conclusion or the discovery of a phenomenon. Developments of a theory often result in a change in paradigm--that is, looking at or thinking about a scientific problem in a totally different way.

I should think there are several "theories" floating out there. There may be one that is "popular" but that does not make it any more or any less valid. I mean, some make connections about the missing link, only to find out it was a hoax, like some made up from a pig's tooth in Africa. I do not see any cross species evidence. I am not saying it is not possible, only that science can never answer the deeper questions of which faith does.