To continue this weekend's writing theme here's an interesting website:
The Preservation of Favored Traces.
Watch On the Origin of Species change across six editions as Darwin reconsidered his arguments and responded to criticisms.
It takes a while to load but once the screen comes up you can click on fast to speed it up. Then hold your mouse over the page to see the edits - you'll see what I mean. A very interesting way of visualizing the writing process that I haven't seen before.
I think I need a new tag for 'Well worth playing around with for a few minutes'. Done.