Underwater Archaeology: 17th century gun-carriage salvaged from London wreck Genetics: A federal origin of Stone Age farming Nigeria: The British Museum distorts history and denies its racist past Northern Europe: The last Viking and his 'magical' sword? UK: 17th century plague pit unearthed in London Travel: 'Celts: Art and Identity' at the British Museum Evolution: Size matters—the more DNA the better Endangered Species: Biodiversity falls below ‘safe levels’ globally Greenland: Huge ancient river basin explains location of the world's fastest flowing glacier