24 hours in pictures

Tiree, UK: Competitors take part in the Corona Extra PWA World Cup 2007 off the coast of the Hebridean island. The world's top 47 wave sailors have come to compete in the week-long event Photograph: Jeff J Mitchell/Getty

Muzaffarabad, Pakistan: A displaced Kashmiri woman stands in a tent village two years after an earthquake killed about 80,000 people and left millions more homeless in the region Photograph: B.K. Bangash/AP

Tehran, Iran: One of an estimated 100 students at Tehran University who took part in a rare demonstration against the president, Mahmoud Ahmadinejad. The protest, in which the president was called a dictator, saw scuffles with counter-demonstrators Photograph: Mehdi Ghasemi/AP

Washington. US: A pigeon rests on the statue of Christopher Columbus during the National Park Service's and the National Columbus Celebration Association's 96th annual wreath-laying ceremony at Union station Photograph: Tim Sloan/AFP

Vallegrande, Bolivia: A student holding flags of social movements listens to a speech by the president, Evo Morales, at a ceremony marking the 40th anniversary of Ernesto 'Che' Guevara's death Photograph: Dado Galdieri/AP

Buenos Aires, Argentina: A tomato is wrapped in a plastic bag with a sticker showing the 'real' price at a fruit stand. Consumers today began a boycott of tomatoes, which have risen nearly 50% in price this year Photograph: Leo La Valle/EPA

Beijing, China: A woman at an exhibition on the Communist party walks past a statue of its late leader Mao Zedong Photograph: Guang Niu/Getty

London, UK: Anti-war protesters in Parliament Square Photograph: Stephen Kelly/PA

US: A close-up shows tin 'whiskers' on the tin-plated steel housing of a variable air capacitor, used in a 1960s Grundig radio. Tin whiskers are tiny tin strands that sprout without warning from tin finish or solder, short-circuiting electronics. By some estimates, they have caused up to £5bn in damage since they were first noticed, in the 1940s Photograph: NASA/NEPP/AP

London, UK: A worker climbs in a sculpture near the O2 dome to carry out maintenance work Photograph: Tom Hevezi/AP

Mansoura, Egypt: A rice farmer burns hay in a field, the traditional method of clearing fields before planting new crops. The practice remains common in Egypt, even though it is prohibited for environmental reasons Photograph: Asmaa Waguih/AP

Jerusalem, Israel: Muslim worshipers pray during Lilat al-Qader, also known as the Night of Power, in front of the dome of the Rock Mosque, in the al- Aqsa mosque compound. According to tradition, the Qu'ran was revealed to the prophet Muhammad during the night of Lilat al-Qader Photograph: Atta Awisat/AP

New Delhi, India: Schoolchildren try to break the Guinness world record for the greatest number of people brushing their teeth at the same time Photograph: Money Sharma/EPA

Half Moon Bay, US: Farmers at the 34th annual Safeway World Championship Pumpkin Weigh-Off Photograph: Justin Sullivan/Getty

London, UK: A Sothebys auction house employee with a painting entitled The Rude Lord, by the British artist Banksy Photograph: Shaun Curry/AFP

Hof, Germany: A woman walks past signs at the Fernwehpark (literally, 'wanderlust park'), where more than 3,000 signs from all over the world are displayed Photograph: Uwe Meinhold/AFP

London, UK: A work of art entitled Arch of Hysteria in Bronze, by Louise Bourgeois, in a retrospective of her work at Tate Modern Photograph: Edmond Terakopian/AFP