Computers and Evolution
One day, two computer programs were taking a break, having a cup of tea in the hard drive of a laptop. Recently, another computer program had failed to respond and had been deleted from the laptop. The two programs, feeling philosophical about their old friend, started talking about the meaning of life, where they had come from, how they should live and what happens after deletion. They were specifically concerned with where they came from. However, after much conversation and many cups of tea they could not decide.
You can read the entire article in context at "The Parable of the Two Computer Programs".The past course of events can neither be directly observed nor repeated. When people work within the realm of origins science they come to it with a set of presuppositions, or a worldview.