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Hundreds of ancient drawings depicting decapitated human heads and domesticated llamas have been discovered in the Peruvian desert with the help of artificial intelligence. Archaeologists have previously linked these creations to the people of the Nazca culture, who started etching such images, called geoglyphs, into the ground around 2000 years ago. These geoglyphs are smaller and older than the Nazca lines and other figures found to date, which portray huge geometric shapes stretching several kilometres or wild animals about 90 metres long on average. The newly discovered images typically depict humanoid figures and domesticated animals around 9 metres long. Some even hint at human sacrifice, portraying decapitated heads and killer whales armed with blades.

Every year, millions of tourists flock to Northern Ireland to visit Giant's Causeway - an unusual formation of around 40,000 hexagonal stone columns descending gently into the sea. Theories on the stones' formation range from them being built by a mythical giant Finn McCool to more scientific explanations. Now, Dr Mike Simms, curator of natural sciences at National Museums NI, has put forward the first new theory since 1940. Dr Simms considered why the extraordinary geological features are found at sea level only. To mark Unesco's International Geodiversity Day today, he has explained why he believes they were caused by an event which took just days - and not thousands of years as previously thought.