This video illustrates how close we are to achieving "sense and avoid" capabilities that could satisfy aviation authorities around the world, if only for smaller UAVs at this stage.

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Researchers at the University of North Dakota, working with NASA and others, recently flew a Cirrus SR22 equipped with special software to see if it could sense and avoid conflicts with a nearby Cessna 172.

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To be sure, not every high-profile prosecution ended up with jail time, and most businesspeople have enough common sense and decency to avoid fleecing investors while making a living.

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They can enhance a sense of community, and avoid the defiance that can sabotage well-meaning laws, such as tobacco taxes that spawn smuggling.

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It made better sense to settle the loan quickly and avoid paying more interest.

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Some fear, of course, is sheer good sense, motivating householders to install burglar alarms and unaccompanied women to avoid dark streets late at night.

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We know there are ways to wean people off high energy foods and to convert poor eating habits but we need to avoid any sense of social engineering in case we get this wrong.

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It is hard to avoid the view that the Committee has sometimes allowed preconceived judgments to cloud its objectivity and sense of fairness.

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As well as making sure that you take precautions to try to avoid frozen or burst pipes it also makes sense to make sure that your insurance policy covers burst and frozen pipes, and any subsequent damage to your property, while it is empty.

BBC: Fergus Muirhead