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There is a tension between being persistent with a project and knowing when is the right time to give up. Novels take a long time to write, but how long is too long? This article on deciding when to start a new story has some interesting ideas.
While I was on holiday this year, I picked up some postcards with amazing images of earth taken from the International Space Station. The one of Britain and Ireland seems to have made it into a couple of papers in the summer. They were taken by Italian astronaut, Paulo Nespoli, and the whole set can be seen at the European Space Agency's photostream.