Because flashy, dominant males tend to mate with disproportionately more females than dull, unassuming ones it makes sense to focus on bringing the best sons to the peak of perfection with a hormone injection that makes them look even flashier than their genes alone would allow.

ECONOMIST: Animal behaviour

From peak output in 2003 of 2.1 million bpd, Cantarell, despite a campaign of nitrogen injection and tender loving care, has fallen to about 400, 00 bpd.

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