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The United Nations' 2012 World Drugs Report says the nation with the highest level of cannabis use among adults is Palau, a tiny micronesian island nation.

The World Health Organisation says Palauans drink more beer, per capita, than anyone else. What's going on in Palau?

Also in the programme - what do CERN scientists mean when the talk of a "5 sigma" event?

(Image: A cannabis plant. Credit: Gareth Fuller/PA Wire)