An ancient Antarctic rainforest

An expedition drilling into the sea-floor near the South Pole has discovered the root network of an ancient forest. It reveals surprisingly high temperatures in the Antarctic during the Cretaceous period, and the existence of a rich, temperate rainforest just 900km from the Pole. Read the research here: Sign up for the Nature Briefing: An essential round-up of science news, opinion and analysis, free in your inbox every weekday: