Catalin Cimpanu, writing for BleepingComputer: Attackers can use sound waves to interfere with a hard drive’s normal mode of operation, creating a temporary or permanent denial of state (DoS) that could be used to prevent CCTV systems from recording video footage or freeze computers dealing with critical operations. The basic principle behind this attack is that sound waves introduce mechanical vibrations into an HDD’s data-storage platters. If the sound is played at a specific frequency, it creates a resonance effect that amplifies the vibration effect. Because hard drives store vasts amounts of information inside small areas of each platter, they are programmed to stop all read/write operations during the time a platter vibrates so to avoid scratching storage disks and permanently damaging an HDD. Last week, scientists from the Princeton and Purdue universities published new research into the topic, expanding on the previous findings with the results of additional practical tests. The research team used a specially crafted test rig to blast audio waves at a hard drive from different angles, recording results to determine the sound frequency, attack time, distance from the hard drive, and sound wave angle at which the HDD stopped working.

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Source: Slashdot – Acoustic Attacks on HDDs Can Sabotage PCs, CCTV Systems, ATMs, More

Is there a link between polygamy and war? The Economist explores (might be paywalled): Men in South Sudan typically marry as often as their wealth — often measured in cattle — will allow. Perhaps 40 percent of marriages are polygamous. “In [our] culture, the more family you have, the more people respect you,” says William, a young IT specialist in search of his second wife. Few South Sudanese see the connection between these matrimonial customs and the country’s horrific civil war. If you ask them the reason for the violence, locals will blame tribalism, greedy politicians, weak institutions and perhaps the oil wealth which gives warlords something to fight over. All true, but not the whole story. Wherever it is widely practised, polygamy (specifically polygyny, the taking of multiple wives) destabilises society, largely because it is a form of inequality which creates an urgent distress in the hearts, and loins, of young men. If a rich man has a Lamborghini, that does not mean that a poor man has to walk, for the supply of cars is not fixed. By contrast, every time a rich man takes an extra wife, another poor man must remain single. If the richest and most powerful 10 percent of men have, say, four wives each, the bottom 30 percent of men cannot marry. Young men will take desperate measures to avoid this state. A non-paywalled, syndicated source for the article.

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Source: Slashdot – The Link Between Polygamy and War