Remember, there is a very fine line separating opportunity at the leading edge and the cash-eating bleeding edge.

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But that is an issue that, frankly, could sink his campaign so he is walking a very fine line.

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Sprint is treading a very fine line here by betting on its own LTE network and the iPhone deal.

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It seems there is a very fine line between research and conspiracy.

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"It's a very fine line you draw, whether it's new or it isn't, " says Peter Appelbaum , a pathologist at Hershey Medical Center and a professor at Pennsylvania State University.

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Just as there exists a very fine line between brilliance and insanity, there also exists a fine line between passion and many negative traits such as narrow-mindedness, narcissism, fanaticism, delusion, and even paranoia.

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It is very much a fine line a given brand walks when it comes to branded content marketing.

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"In our manifesto we are very carefully treading a fine line between calling for things that are just going to be a non-starter, where the rest of Europe will say 'just forget it', and choosing those topics that are really important to Britain, that would really be a game-changer for Britain's relationship with the EU, " Mrs Leadsom told the BBC Radio 4's Today programme.

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But as we learned in the disastrous HMO experiment of the 1990s, there is a fine line between managing care (a very good thing) and cost-cutting.

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