Open day two as it happened Korea's KJ Choi leads two-time champion Greg Norman by one shot in the second round at the 137th Open. Useful links A list of websites benefiting teachers and students taking part in BBC News School Report. Snared in a homemade 'NitroNet' Humans are using too much nitrogen, and leaving so much of it that the natural world is struggling to cope. Country profile: United Kingdom Key facts, figures and dates Profile: Peter Hain A look at the career of ex-Work and Pensions and Welsh Secretary Peter Hain. EU trade chief lambasts Sarkozy EU Trade Commissioner Peter Mandelson accuses French President Nicolas Sarkozy of undermining him. Q&A: The Lisbon Treaty Key questions answered on the EU's reform treaty, which is now in trouble after Irish voters rejected it. Celtic Tiger's economy shrinks The Irish Republic's economy shrinks by 1.5% in the first three months of the year, official figures show. Building company to close factory A timber frame house manufacturer announces the closure of one of its plants with the loss of 59 jobs. Cameron attacks Brown over treaty David Cameron says the PM has let down Britain, Ireland and Europe in failing to declare the EU Treaty "dead".