By comparing the progress of tadpoles with different fathers but the same mother, the paternal genetic influence was easy to see.

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The hope is that by comparing the different pre-fall projections with the observed re-entry data after the event, future modelling efforts can be finessed.

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Comparing an AMD chip to an Intel chip was a lot like comparing different varieties of apples: essentially the same, but with subtle differences.

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One is that by comparing the results from 2005 with results from trips to the Windward Isles in different years, the team has shown that the size of the sink changes markedly over time, which is not what previous studies of sinks have assumed.

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Although she says that in practice A-levels are now so different from a generation ago that it is "not comparing like with like".

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Comparing pledges to Unep with a country's gross national product, though, gives a very different picture.

BBC: UN environment champ in cash crisis