Robert Roy Britt: Swine Flu Is Evolution in Action
While much of the modern controversy over evolution centers around whether humans evolved from non-human primates (scientists overwhelmingly agree this is the case), some people still try to poke holes in the theory of evolution, one of the most solid theories in science. In addition to evidence from ancient fossils and modern DNA studies, one of the many lines of evidence supporting evolution is that it can quite simply be seen in action among some species that evolve particularly rapidly, such as fruit flies.
But on no stage does evolution unfold more quickly or with more potentially sickening or lethal consequences for humans than among viruses. It is, to pass on a scary phrase used among scientists and marketers, viral evolution. And you could be the star host of this all-too-often deadly show.
The sudden ability of the new swine flu virus to hop from pigs to humans and then to skip from person to person, at least in Mexico, is an excellent example of evolution at work.
http://www.livescience.com/health/090428-swine-flu-viral-evolution.html