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"Bitcoin-Central got the go-ahead thanks to a deal with French financial firms Aqoba and Credit Mutuel. The exchange is one of many that swaps bitcoins, computer generated cash, for real world currencies. The change in status makes it easier to use bitcoins and bestows national protections on balances held at the exchange."

Scientists are pioneering the use of 3D printers to create drugs and other chemicals at the University of Glasgow. Researchers have used a £1,250 system to create a range of organic compounds and inorganic clusters - some of which are used to create cancer treatments. Longer term, the scientists say the process could be used to make customised medicines.

A report in the New Journal of Physics shows how the quest for an invisibility cloak is leading to cleverer ways to use and manipulate light. The trick could aid the analysis of complex samples or even communications.

Archaeologists may not need to get their hands so dirty any more, thanks to the kind of digital technology being pioneered at Southampton University. Its 'µ-VIS Centre for Computed Tomography' possesses the largest, high energy scanner of its kind in Europe: a 'micro-CT' machine manufactured by Nikon. Capable of resolutions better than 0.1mm - the diameter of a human hair - it allows archaeologists to carefully examine material while still encased in soil. Using visualisation software, archaeologists can then analyse their finds in 3D. This keeps the material in its original form, and postpones any commitment to the painstaking process of excavation by hand.

"Climate change could severely reduce the areas suitable for wild Arabica coffee before the end of the century. That is the conclusion of work by a UK-Ethiopian team published in the academic journal Plos One. It supports predictions that a changing climate could damage global production of coffee - the world's second most traded commodity after oil. "

Massachusetts Institute of Technology (MIT), one of the world's top-rated universities, has announced its first free course which can be studied and assessed completely online. An electronics course, beginning in March, will be the first prototype of an online project, known as MITx.

Gamers angered at the "bleak" ending of Mass Effect 3 have campaigned for an alternate conclusion - and raised more than $70,000 (£44,000) for charity.

US experts have developed what they say are the most biologically-accurate robotic legs yet. Writing in the Journal of Neural Engineering, they said the work could help understanding of how babies learn to walk - and spinal-injury treatment. They created a version of the message system that generates the rhythmic muscle signals that control walking. A UK expert said the work was exciting because the robot mimics control and not just movement.

We often worry about people who lie awake in the middle of the night - but it could be good for you. Scientists have been saying for 20 years that the eight-hour sleep may be unnatural, and historians increasingly are backing them up.

File-sharing site The Pirate Bay has said that it will adapt rather than die as it faces legal blocks in the UK. On Monday the High Court ruled that the site facilitates copyright infringement. It will decide in June whether ISPs must block UK customers from accessing the site.