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.

FORBES: Magazine Article

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

FORBES: Brazil's Star Power Dims, Economic Growth Weaker Than U.S.

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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The first thing is a surprisingly large and therefore potentially informative variation in performance.

ECONOMIST: Education and the wealth of nations

In a variation on the theme, Avigdor Kahalani, the minister for internal security, suggests that the army should first bomb Beirut's power plants and water supply, to force the authorities to rein in Hizbullah and thus allow Israel to withdraw safely from the southern zone.

ECONOMIST: Israel��s mess in Lebanon