Gordon Brown suffered a devastating blow as Labour succumbed to one of the biggest byelection upsets in political history. The loss of Glasgow East at the hands of the SNP is casting fresh doubt over the prime minister's future. Labour had been defending a majority of 13,500. It should have been a walkover, but with Gordon Brown's government trailing in the polls, Gaby Hinsliff, the Observer's political editor, says it ended up being a test of just how unpopular the government has become.
British couples should have fewer children in order to combat climate change. Family planning expert Prof John Guillebaud of University College London outlines the argument he makes today in the British Medical Journal.
MediaGuardian columnist Roy Greenslade explains why he's not surprised the News of the World lost its legal battle against formula one chief Max Mosley.
Russia is considering using bases in Cuba to refuel its nuclear jets. The threat has a strong echo of the 1962 Cuban missile crisis. Moscow correspondent Luke Harding says Russia would not take such action for any other reason than to annoy Washington.
Charles Arthur explains the significance of the music industry's success in getting internet service providers to help combat illegal downloads.
And Randeep Ramesh reports from New Delhi on new academic research into why India always does badly at the Olympics.
