For some time now, I have been fascinated by the Miller-Urey experiment. However, after watching many videos and reading articles, I find that many people either agree and disagree about the validity of the process. I would like to understand the process with a little more depth than what I have found thus far. I would appreciate any thoughts on the topic, as well as some links to any sites that can shine some light on it. Also, I would like to know if there has ever been any molecules found that are able to self-replicate. Thanks in advance for your replies.