Best Actor winner Leonardo DiCaprio used his Oscars acceptance speech to highlight the issue of climate change.

Britain will vote on whether to remain in the EU on Thursday 23 June, Prime Minister David Cameron has said. The prime minister made his historic announcement in Downing Street after briefing the cabinet. He said he would be campaigning to remain in a reformed EU – and described the vote as one of the biggest decisions “in our lifetimes”.

Stairway to Heaven was one of the biggest rock songs of the 1970s – loved, imitated and sometimes parodied. Now Led Zeppelin’s classic track is back on the turntable, on a re-mastered version of the band’s fourth album. 43 years after its release, the song continues to hold a place in many music fans’ hearts. Guitarist Jimmy Page gives a personal account of how a rock anthem came together.

While many voters won’t pay attention until a few weeks before Election Day, running for president takes years of active planning, fundraising and calculation. Here’s what you need to know to understant the American voting system.