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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. In the early 1990s, psychiatrist Thomas Wehr conducted an experiment in which a group of people were plunged into darkness for 14 hours every day for a month. It took some time for their sleep to regulate but by the fourth week the subjects had settled into a very distinct sleeping pattern. They slept first for four hours, then woke for one or two hours before falling into a second four-hour sleep.
The myth of the eight-hour sleep
They are young, tech savvy and babies of the Baby Boomers. They form the next generation to inherit the earth. They are the Millennials. But just who are they?
VIDEO: Meet Windsor's Millennials - Windsor
30 January 2012 Last updated at 19:09 ET By Shilpa Kannan BBC News, Tirumala Green temple: India's Tirupati Temple has adopted a range of green technologies - and the shrine is now trading carbon credits Surrounded by seven hills, high above lush green forests is the temple town of Tirumala. The crown jewel is the dazzling gold-plated temple of Lord Venkateshwara.
Tech conversion: India's richest shrine goes green
Speed-of-light experiments give baffling result at Cern
23 September 2011 Last updated at 13:03 ET By Jason Palmer Science and technology reporter, BBC News Enormous underground detectors are needed to catch neutrinos, that are so elusive as to be dubbed "ghost particles" A meeting at Cern, the world's largest physics lab, has addressed results that suggest subatomic particles have gone faster than the speed of light. The team has published its work so other scientists can determine if the approach contains any mistakes. If it does not, one of the pillars of modern science may come tumbling down. Antonio Ereditato added "words of caution" to his Cern presentation because of the "potentially great impact on physics" of the result.
13 September 2011 Last updated at 13:50 ET By Leila Battison Science reporter, Bradford Rare earth metals are vital for production of a range of electronic items The relative risks to the supply of some of Earth's rarest elements have been detailed in a new list published by the British Geological Survey (BGS). So-called "technology metals" like indium and niobium are extracted from the Earth and are used in a wide range of modern digital devices and green technologies.
Earth’s rarest metals ranked in a new 'risk list'
