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It was the year we learned of a spectacular smash-up in space, and scientists working on the world's biggest physics experiment delighted at collisions of an entirely different sort. There were shockwaves, too, in Copenhagen, as the summit failed to reach a consensus on tackling climate change, instead merely noting a deal struck by major powers including the US and China. The BBC's science reporter Paul Rincon looks back at the twists and turns of a year in science and the environment.

One of the specialty areas of the RCMP is accident reconstruction. These people analyze traffic accidents to determine the cause of an accident and the causes of any injuries that people sustained. It is also their job to decide whether or not the accident was preventable.

""Although the tiny fireballs will only exist for a fleeting moment (less than a trillionth of a trillionth of a second) the temperatures will reach over ten trillion degrees, a million times hotter than the centre of the Sun," said Dr Evans."