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UK releases classified UFO files (May 13)
The UK's Ministry of Defence has started releasing decades' worth of UFO-related files – predictably, some are downright bizarre



Wild sloths are no sleepyheads after all (May 13)
The first study to analyse sloth sleep patterns in the wild has profound implications for the understanding of sleep in both animals and humans



Mars probe set for nail-biting touchdown (May 13)
NASA's Phoenix probe will experience a harrowing few minutes on 25 May when it attempts to land on the Red Planet without airbags



Readers' Q&A: The science of sex (May 13)



Doubt cast on source of universe's mightiest particles (May 13)
Last year, researchers suggested ultra-high-energy cosmic rays originated near colossal black holes, but a new study questions that conclusion



Childbirth simulator helps trainee medics get a grip (May 13)
A few lessons in handling babies using an animatronic set up greatly increases junior doctors' competence in difficult forceps deliveries



Liquor-store sales linked to violent assaults (May 13)
An analysis of health records and alcohol sales receipts shows that hospitalisations for assault increase as more booze is bought locally



Virtual telescope brings the cosmos to your desktop (May 13)
A free Microsoft program called WorldWide Telescope lets users zoom in on cosmic images from the world's best observatories



New material may be step towards 3D invisibility cloak (May 13)
A prism that bends light the "wrong way" could be the first 3D version of the metamaterials that allow unnatural powers over light



Accepted level of earthquake risk in China 'too high' (May 13)
The people of Sichuan are now paying the price for living in buildings built to withstand a quake one-fifth as powerful as the one that hit on Monday