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22 February 2012 Last updated at 11:58 ET By Stephanie Hegarty BBC World Service We often worry about lying awake in the middle of the night - but it could be good for you. A growing body of evidence from both science and history suggests that the eight-hour sleep may be unnatural.
The Csepel neighborhood of Budapest is a 2,000-acre sprawl of working-class apartments and factories. A large swath of the district used to be solely the domain of heavy industry, where each street took its name from the goods produced inside the mostly abandoned brick buildings lining its curbs. It is here, in a nondescript building on Bicycle Street , blocks from Power Station Street and Petroleum Street, where a handful of engineers are building a bicycle from another world .
A black hole discovered by NASA's Chandra X-ray Observatory is generating winds blowing at 20 million miles per hour - about three percent of the speed of light. "This is like the cosmic equivalent of winds from a category five hurricane," says Ashley King from the University of Michigan. "We weren't expecting to see such powerful winds from a black hole like this." IGR J17091 is a binary system in which a sun-like star orbits the black hole. It's located in the bulge of the Milky Way galaxy, about 28,000 light years away from Earth. The wind emanating from it is nearly 10 times faster than has ever been seen before from a stellar-mass black hole, and matches some of the fastest winds generated by supermassive black holes - which can be billions of times more massive.
First introduced by Microsoft in 1999, many viewed the Tablet PC as a toy, a device that couldn’t get any real work done. With the release of Apple’s iPad in 2010, the mobile computing world has been consumed with tablets. A mobile device that is bigger than a smartphone, but smaller than a laptop, Tablet PCs are quickly becoming the device of choice for professionals who need the power of a computer, with the portability of a smartphone.