Tag Archives: baffled

This Mysterious Skull Has Baffled Scientists for 60 Years—Until Now

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A peculiar fossil skull discovered in a Greek cave over six decades ago may finally reveal some of its mysteries. Recent analysis indicates that at least 300,000 years ago, the early Homo sapiens coexisted with the first Neanderthals in Africa and Europe.

Unearthed in northern Greece in 1960, the Petrarona skull has long puzzled paleontologists, who are challenged to place it within the human lineage.

The fossil includes traits from Neanderthals and Homo erectus, yet it was found completely isolated, lacking artifacts or animal bones that could provide context for dating.

“The moment I examined and measured it, I realized it wasn’t a Neanderthal or Homo erectus,” stated Professor Chris Stringer, a paleontologist and co-researcher at the Museum of Natural History in London, in an interview with BBC Science Focus. “It was something unique.”

Stringer has long believed that the specimen belonged to our relative, Homo heidelbergensis, a robust human species that existed hundreds of thousands of years ago across Africa, Europe, and possibly Asia.

However, without a reliable date for the skull, understanding its place in the human narrative remained difficult.

A recent study utilized uranium series dating on the fossil’s calcite coating.

Calcite, one of the most common mineral forms of calcium carbonate, forms as water seeps into the pores and cavities, resulting in new mineral structures. This uranium series dating method estimates fossil ages by analyzing the calcite and measuring the decay level of uranium within it.

The findings suggest an age of approximately 286,000 years. Nevertheless, the methodology raises questions about the skull’s actual age.

“If fossil calcite forms swiftly after deposition in the cave, an age of around 288,000 to 290,000 years is plausible for the fossil,” Stringer noted.

“However, if the fossil was in the cave before the calcite developed, that age is a minimum estimate.”

The Petrarona skull, partially coated with calcite, is now estimated to be nearly 300,000 years old – Credit: Chris Stringer

Despite this caution, the timeline for Petrarona now closely aligns with another well-known Homo heidelbergensis skull from Kabwe, Zambia, which dates back about 300,000 years.

“Morphologically, they are similar and seem to be converging in their dating,” Stringer remarked.

This discovery underscores the idea that Homo heidelbergensis had a broad geographic presence and an extensive time span, overlapping rather than directly giving rise to other human species.

In simpler terms, contrary to earlier beliefs, they are not the common ancestors of modern humans and Neanderthals; Homo heidelbergensis was likely our contemporary for at least some time.

Stringer emphasized that this enriches our understanding of human evolution.

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Source: www.sciencefocus.com

Scientists are baffled by the discovery of a mysterious cosmic sphere in the universe

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Discovered by chance in 2019, Odd radio circles (ORCs) are circular regions of faint radio radiation with bright edges that are not visible to optical, infrared, ultraviolet, and X-ray wavelengths.

Some ORCs contain galaxies at their centers, while others do not, but what sets them apart is their size, which is significantly larger than normal galaxies. Some ORCs display a double ring structure, while others have a single ring. There are also some with internal arc-like structures that might be linked to galaxies surrounded by bubbles of radio emission.

While objects with high spherical symmetry are common in the universe, ORCs appear to be distinct from them all, prompting astronomers to classify them as a new type of object.

ORCs could potentially be a type of spherical shock wave generated by fast radio bursts, gamma-ray bursts, or neutron star mergers. If this is the case, they must be extremely ancient to have grown to such a large size.

Alternatively, they may be associated with material jets emanating from the central regions of radio galaxies, but explaining their size and the absence of central objects in all galaxies is challenging.

One intriguing theory suggests that ORCs are created by the fusion of two supermassive black holes in a central galaxy. The available data also support the idea that the shell is caused by a “shock termination” of high-energy particle winds from the central “starburst” galaxy.

Another hypothesis proposes that the ORC is the throat of a “wormhole,” a theoretical passage through spacetime. However, astronomers have yet to agree on the true nature of ORC.

This article addresses the question (by Bradford’s Brendan Owens): “What are strange radio circles?”

If you have any questions, please email us at: questions@sciencefocus.comor send us a message Facebook, Xor Instagram Page (remember to include your name and location).

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Source: www.sciencefocus.com

Scientists Baffled by Mummified Rat Found on 20,000-Foot Volcano: How Could Anything Be Living There?

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A view from the top of Sarin Volcano, one of three volcanoes in the Andes where researchers discovered the mummified corpse of a rat. The combined analysis of mummies and the capture of live specimens suggests that the rodents are able to climb Mars-like peaks on their own and somehow survive there.

This study rules out any connection to Inca rituals and suggests that the rats ascended independently.

At the top of a 6,000-foot volcano in the middle of the driest desert on earth, the environment was harsh and unforgiving. Temperatures were consistently below freezing, oxygen levels were less than half that at sea level, and strong winds whipped over the mountaintops across the sparse, rocky terrain.

In the 1970s and 1980s, carcasses of several rats were first discovered during expeditions to several Andean peaks, and researchers believed that the rodents must have hitchhiked with the Incas. It was initially thought that these pinnacles served as altars for the ceremonial sacrifice of children to the Inca gods. This led to the assumption that the rats probably rushed into the firewood and other supplies that the Incas had hauled up the slopes, or they were sometimes among the animals sacrificed along with humans.

In early 2020, a live specimen of a hedgehog was captured at the 22,000-foot peak of Lullillaco, a volcano that straddles the Chilean-Argentine border, casting doubt on the initial hypothesis. The analysis of mummified corpses, combined with the capture of live specimens discovered across the Andes, confirmed that the rats ascended the volcanoes independently. The capture of additional live specimens and the study of the mummies further solidified the evidence that the rats are able to survive at such high altitudes.

Further research and analysis are underway to understand the genetic insights and mysterious survival of the rats and to determine what drives rats to such high altitudes. The researchers are working to answer the ongoing question of why the rats rise to such extreme altitudes in the first place. This research was funded by grants.

Source: scitechdaily.com