They carried out the first genome-wide analysis of the genetic variation between different regions of the same tumour using samples of kidney cancer.

BBC: DNA analysis shows huge genetic diversity in tumours

Hence the careful wording of pub quiz questions about the first woman MP, which usually include some variation of the phrase "to sit in the Commons".

BBC: Numbers game

About three-quarters of the variation of guaranteed first-round money is explained by draft position, Rishe's analysis shows.

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An optimist may point out that the positive variation in the first month of the second quarter could suggest better days ahead.

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For example, a recent (2007) study by Sebat et al. found a clear link between ASD and de novo copy number variation (de novo mutations are those that arise for the first time in the children).

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