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| Hovering not hard if you're top-heavy Posted: 10 Feb 2012 10:32 AM PST Top-heavy structures are more likely to maintain their balance while hovering in the air than are those that bear a lower center of gravity, researchers have found. Their findings are counter to common perceptions that flight stability can be achieved only through a relatively even distribution of weight—and may offer new design principles for hovering aircraft.  |
| Cannabis use doubles chances of vehicle crash Posted: 10 Feb 2012 08:12 AM PST Drivers who consume cannabis within three hours of driving are nearly twice as likely to cause a vehicle collision as those who are not under the influence of drugs or alcohol claims a paper published today on bmj.com.  |
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