The BBC has a nice article about evolution. Of humans. Here.
"I see you're still using traditional software on your computer, Bob. Don't you know that stuff is susceptible to Microsoft Outlook viruses? Have you tried Openoffice? It's free! It's free because it is developed using a leading-edge development method that's superior to the old-fashioned way that Microsoft develops software. Microsoft software is expensive because the conventional methods they use to create it are inefficient. That's why there are so many Microsoft viruses around. There aren't any OpenOffice viruses. Why don't you give it a try?"