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Can you tell real laughs from fake?

3 July 2012 Last updated at 03:51 BST

The Royal Society - the UK's academy of science - has opened its doors to the public for its annual summer science exhibition.

Researchers there are putting the latest in science and engineering on display - from a laughter lab to robotic footballers.

The BBC's science reporter Rebecca Morelle has been taking a look around.

Video by Rachael Buchanan