24 hours in pictures : December 12 2007

London, UK: A man walks through early mist on a frosty morning Photograph: Lefteris Pitarakis/AP

Bali, Indonesia: Environmental activists arrange balloons outside the venue for UN talks on global warming Photograph: Made Nagi/EPA

Jinju, South Korea: A cloned cat (right) which was genetically modified to have a red fluorescent protein in its skin glows in ultraviolet light, while the normal cat does not Photograph: Gyeongsang University/EPA

London, UK: A pig figure floats above Battersea Power Station to advertise The Simpsons Movie, in an echo of the inflatable pig which floated in the same spot in 1976 for the cover of the Pink Floyd album, Animals. Photograph: Cate Gillon/Getty

Rotterdam, Netherlands: Cunard liner the Queen Victoria arrives on her maiden voyage Photograph: Robin Utrecht/AFP

Nanjing, China: Chinese soldiers carry wreaths in a rehearsal for a ceremony marking the 70th anniversary of the Nanjing massacre Photograph: Liu Jin/AFP

Algiers, Algeria: Rescuers and forensic policemen work at the site of yesterday's bomb blast Photograph: HO/AP

London, UK: The world's fastest human calculator, 27-year-old Alexis Lemaire, breaks his own record by calculating the 13th root of a random 200-digit number in just over 70 seconds Photograph: Shaun Curry/AFP

Valencia, Spain: A woman at an exhibition dedicated to Marilyn Monroe Photograph: Kai Foersterling/EPA

Santo Domingo, Dominican Republic: A dog shelters from rain brought by tropical Storm Olga Photograph: Ramon Espinosa/AP

Des Moines, US: Ice covers a snowman outside the campaign headquarters of Democratic presidential hopeful Barack Obama. Photograph: Scott Olson/Getty

Moscow, Russia: Students in a dormitory watch a TV address by Dmitry Medvedev, endorsed this week by Vladimir Putin to become the country's next president Photograph: Maxim Shipenkov/EPA

Rome, Italy: Empty shelves in a supermarket. Italy's truck drivers lined up their vehicles on highways to block traffic on the second day of a protest that is causing shortages of petrol and basic foodstuffs across the country Photograph: Pier Paolo Cito/AP

Allahabad, India: A Sadhu, or Hindu holy man, smokes a pipe to beat the cold on a chilly morning. A cold snap sweeping Uttar Pradesh state has claimed the lives of eight people Photograph: Rajesh Kumar Singh/AP

Najaf, Iraq: A young Iraqi boy watches over a herd of water buffalo by the Euphrates river Photograph: Alaa al-Marjani/AP