London, UK. 20th March. 2015. International Day of Happiness flash mob in Trafalgar Square, London. The IDOH was established by the United Nations General Assembly in 2012 to recognise happiness as a fundamental human goal and raise awareness of the right to be happy. Credit: Paul Brown/Alamy Live News

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Photo credit: © Paul Brown / Alamy / Afripics
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Keywords: happy smile smiling people smiles, happy smile smiling people smiles