Yet he would still be practicing medicine today if not for the single-minded persistence of a junior doctor, Andrew Bower, who, unlike virtually everyone else in the university hospital, strongly suspected Colin Bouwer of murder and worked with the police to bring him to justice.

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That is the biggest single reason for the persistence of poverty.

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It isn't clear that any single factor is behind the persistence and growth of pickpocketing and purse snatching in many cities.

WSJ: Pickpockets: The Low-Tech Security Risk