In addition, little was known about the role that positive selection may have played in shaping the biology of human populations as they migrated and expanded.

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Obviously there have been instances when a player has felt aggrieved and there were times in my career where I felt hard done by, but overall I believe the continuity of Australia's selection process has had a positive affect on the consistent performances of the team.

BBC: Justin Langer column

The impressive results may partly derive from positive selection.

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After controlling for self-selection bias, the impact of PBC on reliability shifted from negative to strongly positive.

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Using a selection of hip-hop songs that are "positive and sexy, " the class begins simply and works up to a sweaty, hip-twisting, shoulder-shaking finale, followed by a cool-down.

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The point is that a bowler like Harmison can have such an impact a positive or negative impact on his team that he will always be a tough one to discuss at the selection table.

BBC: Justin Langer column