This is very cool. It turns out that prions evolve. Prions are not composed of DNA or RNA. They are simply proteins. Often they are similar to proteins found in living creatures, like us. They cause the similar proteins to "fold" in a way that makes the similar proteins just like the prions, thereby replicating the prion. These mis-folded proteins then lose their original functionality. The prions form long polymers, destroying cells in the process. This is the cause of bovine spongiform encephalopathy (mad cow disease), and the human equivalent, Creutzfeldt-Jakob disease. It's also responsible for a very rare, inheritable disease which causes the inability to sleep, leading to madness and then death.
This pretty much confirms (yet again) that evolution through mutability and natural selection not only works, but works in any system in which information is replicated and to which a selection filter is applied.
Why do I suspect there will still be folks who deny the process works, pretty much as Darwin said it did? Here's something that doesn't have even RNA, let alone DNA, performing in a way predicted by Darwin 150 years ago. Yet I think there will be many who will ignore this new (and extremely interesting) data.
Anyway, the article is interesting. Enjoy.
"Yes, I seriously believe that consciousness is a product of a natural process. I find that the neuroscientists, psychologists, and philosophers who proceed from that premise are the ones who are actually making useful contributions to our understanding of the mind." - PZ Myers