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When archaeologists explored an underwater cavern in southern Mexico in 2014, they were shocked by what they found. The cavern is known as Sac Uayum, and is located in Mexico’s Yucatán peninsula. It is technically a cenote – a natural pit that comes about after limestone bedrock collapses, exposing groundwater beneath. Local villagers were said to be terrified of the spot, because pits like this were sometimes used by the ancient Maya for sacrificial offerings. Archaeologist Bradley Russell, from College of St Rose, and a group of divers scaled down roughly 20 metres into the unknown. Inside the pit were two chambers with human bones and skulls scattered across the floors of each. The skulls were elongated, as part of an ancient practice that is thought to have involved flattening people’s heads during infancy. Archaeologists still don’t know why the ancient culture did this – but it ain't pretty. The cenote sits just outside the ruins of the ancient Maya city of Mayapán, and the researchers think this shows that, like the modern day locals, the ancient Mayans kept their distance too. Local legend says that Sac Uayum is guarded by a feathered, horse-headed serpent. Older residents of the nearby village of Telchaquillo tell stories of people seeing the serpent perching in a tree, leaping up, spinning around three times, and diving into the water. Russell explained to National Geographic that the sinkhole is said to be “evil”. “To this day, people do not get drinking water from that cenote, it is generally considered taboo. “It’s off-limits, people do not let their children plan near there and there’s a lot of beliefs around this cenote having evil forces or malevolent forces associated with it. “Cenotes are important because the main access to the water that you get is through these sinkholes. “They are also believed to be access to the Mayan underworld and the homes of Gods. “Mayapan is a large city, it’s incredibly dense, there’s nothing like it in the classic period, it’s incredibly dense for Maya history, there’s nothing quite like it.” He added that the location of Sac Uayum – south of Mayapan – is a clue as to what was going on. In Maya beliefs, south is the direction associated with the underworld. Alternatively, Russell also suggested they could have been plague victims. "You wouldn't want them near the rest of the population. And you wouldn't want to drink the water either.” How to join the indy100's free WhatsApp channel Sign up to our free indy100 weekly newsletter Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

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India’s Chandrayaan-3 lander only touched down on the Moon a month ago, but already it's made some major contributions to science. The spacecraft arrived on the satellite's unexplored south pole on 23 August, securing India's place as the first country to achieve this ambitious feat. Its rover, named Pragyan (or "wisdom" in Sanskrit) then embarked on an exploration of the rocky terrain, equipped with two instruments for conducting chemical experiments. And now, India's space agency, the ISRO, has published the ground-breaking data collected by the bold robot. Pragyan's findings offered a new, detailed insight into what makes up the lunar soil. And whilst scientists were unsurprised by the presence of iron, titanium, aluminium and calcium in the rocks, they were stunned to note a much higher concentration of sulphur than expected. The discovery is significant for a number of reasons. Most significantly, perhaps, because the sulphur could be used to help create a human base on the Moon. As Jeffrey Gillis-Davis, a planetary scientist, pointed out in a piece for Science Alert: "Astronauts and robots could travel from the south pole base to collect, process, store and use naturally occurring materials like sulfur on the Moon – a concept called in-situ resource utilization. "In-situ resource utilization means fewer trips back to Earth to get supplies and more time and energy spent exploring. Using sulfur as a resource, astronauts could build solar cells and batteries that use sulfur, mix up sulfur-based fertilizer and make sulfur-based concrete for construction." Gillis-Davis went on to explain that sulfur-based concrete has a number of advantages over the more common variety used in building, pointing out that it "hardens and becomes strong within hours rather than weeks, and it's more resistant to wear". "It also doesn't require water in the mixture, so astronauts could save their valuable water for drinking, crafting breathable oxygen and making rocket fuel," he added. The presence of sulphur near the Moon's south pole also suggests that highland soils at the lunar poles could have very different compositions to highland soils at the lunar equatorial regions. This would have key implications for our understanding of how the Moon works as a geological system, given that sulfur mainly comes from volcanic activity. Still, there's plenty of work to be done. And while this is all just one small step in Chandrayaan-3's mission, it could mean a great leap in how we view our dear celestial companion. Sign up for our free Indy100 weekly newsletter Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

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The world's largest grassroots Holocaust memorial project has laid its 100,000th personalised plaque, as the US ambassador to Germany honoured her family members who fled...

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