A few months back I came across this wonderful animation in the second half of this video. DNA replication, one of the fundamental mechanisms of life, is the molecular process by which a double stranded thread of DNA is untwisted and then copied to produce two identical double stranded threads. Back in 1976-79, when I studied biochemistry at Leeds University, I learnt about DNA replication, but the details of the mechanism were only sketchily known back then (though I do remember the term 'Okazaki fragments'), and I hadn't kept up with the subject since, so this animation came as quite a revelation to me. In particular I was struck by how parts of the proteins flip back and forth, and how one strand of DNA repeatedly forms a loop which is then realeased. It reminds me of the knitting machine from the Wallace and Gromit film 'A Close Shave'.
This DNA replication mechanism is what Watson and Crick foresaw back in 1953 when they wrote:
It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.
There is a way of looking at things in which all the rest of our lives and our bodies are just ancillary mechanisms to help keep this DNA replication going.