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Gold rings set with garnets look modern but were likely part of a coming-of-age custom 2,300 years ago

Gold rings set with garnets look modern but were likely part of a coming-of-age custom 2,300 years ago

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Archaeologists in Jerusalem say they have discovered a roughly 2,300-year-old gold ring with a red gemstone that's remarkably similar to another piece of jewelry found less than a year ago.
The two rings, small enough to fit a child, were artifacts unearthed at the City of David site in the Jerusalem Walls National Park. The team analyzing the pieces believes the rings may be connected to coming-of-age ritual by young women before marriage, suggesting the items were buried intentionally.
Researchers said the rings, along with bronze earrings, a gold earring resembling a horned animal and a decorated gold bead, likely come from the Early Hellenistic Period in Jerusalem. The Hellenistic era, associated with the spread of Greek culture and influence, lasted from 332 to 141 BC in the city.
Remarking on the novelty of finding so much gold jewelry from this period in Jerusalem, Efrat Bocher, an excavation manager from Bar-Ilan University and the Center for the Study of Ancient Jerusalem, said in a May 21 statement that '(t)his displayed wealth is very rare in any archaeological layer, and it attests to the wealth of Jerusalem and the high standard of living of the city's residents during this period.'
Recovered from the foundations of a large building, both objects were in a layer of dirt dated to the late third century or early second century BC, according to excavation managers Dr. Yiftah Shalev, an archaeologist at the Israel Antiquities Authority, and Yuval Gadot, head of the Sonia & Marco Nadler Institute of Archaeology and professor of archaeology at Tel Aviv University.
The discoveries are shedding light on a chapter of Jerusalem's history known primarily from ancient texts, as only a sparse archaeological record existed — until now, Gadot said.
The newfound gold ring, set with what appears to be a garnet, was in such excellent condition that excavators first thought it was a modern piece of jewelry dropped by a team member. But Rivka Lengler, one of the first excavators to examine the artifact, recognized its ancient design and called over the rest of the team.
'When I held this ring in my hand, I felt that I could actually touch and connect with the people who lived here thousands of years ago,' Lengler said in a statement.
The ring uncovered at the site less than a year ago is also set with a red precious gem and lacks signs of age.
'I was sifting earth through the screen and suddenly saw something glitter,' said Tehiya Gangate, an excavation team member, in a release in 2024. 'I immediately yelled, 'I found a ring, I found a ring!' Within seconds everyone gathered around me, and there was great excitement. This is an emotionally moving find, not the kind you find every day.'
Both rings would fit on a woman's pinkie finger at most, but more likely on a girl's finger, the researchers said.
Dr. Marion Zindel, an archaeologist with the Israel Antiquities Authority, analyzed the rings and believes artisans made them by hammering thin gold leaf onto metal ring bases.
Excavators recovered all the jewelry at the site from beneath the building's floors, suggesting the pieces were placed there on purpose, Zindel said.
One hypothesis is that the jewelry was used in 'a well-known Hellenistic period custom in which betrothed women would bury jewelry and other childhood objects in the house foundations as a symbol of the transition from childhood to adulthood,' Zindel said in a statement.
Associated with the Early Hellenistic Period, the trend of combining colorful gems with gold was influenced by Indian and Persian fashion and brought to the region by Alexander the Great's eastern conquests, which opened trade channels transporting luxury goods between various regions, according to the researchers.
Pieces of jewelry and other finds indicate that the Early Hellenistic Period in Jerusalem was a time associated with wealth and urban planning, but the extent of its residents' prosperity and affluence wasn't previously known, Bocher said.
Excavations in the Givati parking lot, located on the western slope of the City of David hill, have been ongoing for years, she said in a YouTube video sharing the discovery. The excavations have been jointly conducted by the Israel Antiquities Authority and Tel Aviv University.
The team is eager to gain a better understanding of Jerusalem between the first and ninth centuries BC — a period that has been missing from the archaeological record so far — and the city's long, diverse heritage, Gadot said.
The items show that the city's inhabitants were open to adopting Hellenistic cultural trends, lifestyle and architecture — which differs from traditional interpretations from ancient texts about Jerusalem. Experts previously believed the city was culturally isolated, rejecting outside influences, based on mentions in ancient texts, Gadot said. But the jewelry, and the customs associated with its burial, changes that assumption, Gadot added.
Researchers now have a new way of understanding how the region was changing at the time. With few structures and artifacts from the era, it was easy to assume that Jerusalem was a small town. But the discoveries so far have uncovered an entire neighborhood including domestic and administrative buildings that extended westward from the City of David hilltop, where a Jewish temple once sat, Gadot said.
In addition to analyzing the jewelry, the team will also study animal bones, coins and pottery recovered from the site to learn more about interregional connections, the origin of imported goods and even the culinary habits in Jerusalem at the time. The bones could reveal whether inhabitants practiced Kashrut regulations, or kosher Jewish dietary laws, which govern what animals could be consumed, and how they should be prepared and handled.
'We are only now beginning to explore the story of 4th-2nd century BCE Jerusalem,' Gadot said in an email. 'With the Temple at one end and the Hellenic cultural presence at the other end, we want to understand the position of the people living in Jerusalem.'

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Hawaii's volcanic rocks offer proof that Earth's core is leaking gold, study finds
Hawaii's volcanic rocks offer proof that Earth's core is leaking gold, study finds

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time17 hours ago

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Hawaii's volcanic rocks offer proof that Earth's core is leaking gold, study finds

Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Gold and other precious metals are leaking from Earth's core into the layers above, eventually making their way up to the surface during the formation of volcanic islands like Hawaii, a new study suggests. The theory results from a three-year analysis of Hawaii's basaltic rocks, which originally formed from plumes of magma, or molten rock, rising from the ocean floor. Clues in the form of heavy metals found in the volcanic rocks could confirm a suspicion long held by geologists — that Earth's molten core is not isolated but likely bleeds into the rocky mantle, the layer between the planet's thin crust and the core. 'About 40 years ago, people first came up with the theory that maybe the core is losing some material into the mantle, but the signals we got so far were really ambiguous,' said Nils Messling, a geochemist at the University of Göttingen in Germany and lead author of the report, published May 21 in the journal Nature. 'Now, in my opinion, we have the first very strong evidence that some of the core is actually ending up in the mantle.' Scientists already knew that most of the gold on the planet — more than 99.95%, according to Messling — lies hidden in the molten core, along with other heavy elements such as platinum. As meteorites bombarded one another in Earth's early history, a reservoir of these precious metals developed when the core formed about 4.5 billion years ago. But this study suggests that at least a tiny amount of that gold has escaped to the surface, raising the fascinating prospect that, if the leaking continues, more and more of this precious metal could travel from the center of Earth to the crust in the future. 'Our findings not only show that the Earth's core is not as isolated as previously assumed. We can now also prove that huge volumes of super-heated mantle material — several hundreds of quadrillion metric tonnes of rock — originate at the core-mantle boundary and rise to the Earth's surface to form ocean islands like Hawaii,' said study coauthor Matthias Willbold, a professor at the University of Göttingen, in a statement. To find evidence of this core-mantle interaction, Messling and his coauthors obtained some samples of Hawaiian volcanic rocks form the Smithsonian Institution in Washington, DC. 'Some were taken by a submarine, from a deep sea volcano, but (otherwise) it's basically just very ordinary-looking basaltic rock, very unassuming, that you would find anywhere on Hawaii,' he said. 'We started with half a kilogram (1.1 pounds) of rock, we crushed it into a powder, and then we melted it in the oven with some different chemicals, to end up with a sample in liquid form.' From that sample, the team extracted all the elements in the platinum group, which includes platinum itself as well as the lesser-known rhodium, palladium, iridium, osmium and ruthenium. The scientists then focused on ruthenium, a silver-gray metal about as rare in Earth's crust as gold. 'The mantle has almost no ruthenium in it,' Messling said. 'It's one of the rarest elements on Earth. But Earth is basically made of meteorites that crashed together, and meteorites (contain) ruthenium, which went into the core when the core formed. So the mantle has next to no ruthenium, and the core has all of the ruthenium. The same with gold and platinum.' Earth's core has two layers. A hot, solid metal sphere of iron and nickel is roughly 70% the size of the moon, with a radius of about 759 miles (1,221 kilometers). A liquid metal outer core is about 1,400 miles (2,253 kilometers) thick and extends to about 1,800 miles (2,897 kilometers) below the surface, or right up to the mantle. In contrast, the mantle, which lies between the planet's outer crust and the molten core, is 1,800 miles (2,897 kilometers) of mostly solid rock. To determine whether the extracted ruthenium was originally from the core and not the mantle, the team looked at a specific isotope, or type, of ruthenium that was likely more abundant in Earth's early building materials during the time the core formed billions of years ago. 'The vast majority of gold and other precious metals like platinum were likely delivered by massive meteorite impacts during the final stages of Earth's formation — a process known as late accretion,' said Pedro Waterton, an assistant professor of geochemistry at the University of Copenhagen in Denmark who was not involved in the study. The presence of the ruthenium isotope in the basalt samples indicates that at least some of the rock was formed from material coming from the molten metallic core. That's because there is consensus, Messling said, that the material that coalesced during the early stages of Earth's formation does not exist in the meteorite record anymore. He added that the isotope signature in rocks from hotspot volcanoes like the ones in Hawaii is entirely different from any other known rock or meteorite. In other words, the ruthenium isotope Messling found was locked away in the core billions of years ago, so detecting the isotope in volcanic rocks today suggests it comes from the core. 'It's quite a novel and difficult method,' Messling said. 'We managed to measure ruthenium in rocks that have next to no ruthenium in them. In half a kilo (1.1 pounds) of rock, it was less than milligrams — a needle in a planet-sized haystack! That's quite exciting — for a geochemist, at least. It was a long but very exciting process.' So what's the connection with gold? It's chemically similar to ruthenium, Messling said, so if the core is leaking ruthenium, it is also leaking gold in similar quantities. This would be a 'minuscule' amount, however. And even if scientists wanted to extract gold directly from the source, the core-mantle boundary, that's much farther down than current technology could drill. In fact, it's about 236 times deeper than the deepest bore ever drilled — the Kola Superdeep Borehole in Russia, which reaches a depth of 7.62 miles (12.3 kilometers). Proof that the core isn't isolated is particularly thrilling because the core and the mantle shouldn't interact at all, Messling said. 'Their density is too different, like oil and water, so technically they shouldn't mix. And we still don't have a good mechanism to explain why they do. We don't really know much about the core at all,' he said. The Hawaiian rock samples suggest that the leaking process takes between 500 million and 1 billion years to complete, Messling said. 'It's something that has occurred a while ago, and we suspect that it probably has been going on forever, and it's probably still occurring now,' he explained. According to Messling, if the leaking of precious metals is an ongoing process, it could be that at least some of the gold humans have mined may have come from the core even if the quantity of core material in a single rock is negligible, and that the world's supply of gold seems to be replenishing. 'It's a very interesting idea that, although this process is tiny and has zero effect if you look at just one island, if you scale it up to 4.5 billion years it could be that it changes the composition of the Earth,' he said. Researchers who were not involved in the study expressed positive views on the findings. 'We know that the Earth was built from different generations of meteoritic material that were added progressively to the growing planet, and that precious metals from the earliest generations of meteorite material became concentrated into our planet's core while metals from meteorites added in the final stages of the Earth's growth became stranded in our planet's mantle,' said Helen Williams, a professor of geochemistry and planetary science at the University of Cambridge in the United Kingdom. The study, she added, confirms that the mantle plumes — rising jets of molten rock coming from the core-mantle boundary that create hot spots like Hawaii — do indeed contain material somehow derived from Earth's metallic core, said Williams, adding that the result was 'exciting.' Jesse Reimink, an associate professor of geosciences at Pennsylvania State University, agrees. 'This is a very old debate, and new data over the past 10 or so years has reinvigorated the possibility that the core was chemically 'leaking' into the mantle over time,' he said. 'This study really does seem to nail the conclusion — the core does contribute some material to the mantle.' The latest research also strengthens the case made in previous work that some mantle plumes incorporate material from Earth's core, said the University of Copenhagen's Waterton. Does that also mean some of the gold in Earth's crust is originally from the core? 'Yes, but probably only a very small amount,' he said.

Weed increases risk of major health issue — even without smoking: ‘Boy does it screw up the public health messaging'
Weed increases risk of major health issue — even without smoking: ‘Boy does it screw up the public health messaging'

New York Post

time19 hours ago

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Weed increases risk of major health issue — even without smoking: ‘Boy does it screw up the public health messaging'

Your best bud might be breaking your heart. Though many Americans believe daily marijuana use is safer than tobacco, a new study suggests it could increase your risk for some serious cardiovascular issues. Worse yet, gummies, teas and tinctures appear to offer no advantage over lighting up when it comes to one critical factor for your heart health. Advertisement 4 More Americans are using marijuana regularly than ever before. bukhta79 – High stakes for your heart The study from researchers at the University of California, San Francisco involved 55 outwardly healthy Bay Area residents who regularly smoked marijuana or consumed THC edibles. None of the participants used nicotine, and all of them consumed cannabis at least three times a week for a year or more. Smokers averaged 10 years of chronic use; edible users, five. Advertisement Researchers found blood vessel function in regular cannabis users was about half that of non-users — putting them on par with tobacco smokers. 'We found that vascular function was reduced by 42% in marijuana smokers and by 56% in THC-edible users compared to nonusers,' Dr. Leila Mohammadi, lead author of the study, told CNN. That surprised co-author Dr. Matthew Springer. Groups like the American Heart Association had previously suggested edibles might be less harmful to the heart. 'When I first saw the THC result, I said to Leila, 'Scientifically, this THC result is really interesting but boy does it screw up the public health messaging,'' he told SFGATE. Advertisement 4 Studies suggest that smoked marijuana is the most commonly used form. Impact Photography – Notably, researchers found that only marijuana smokers had harmful changes in their blood serum that negatively affected their endothelial cells. These cells line the inside of blood and lymph vessels and help regulate blood flow. Advertisement Springer said this could mean smoking marijuana delivers a 'double whammy' of damage to heart health. The researchers emphasized that while their study indicates a strong association between chronic marijuana or THC use and vascular damage, it doesn't definitively prove the link. Still, it adds to mounting evidence that chronic cannabis use could be bad news for the heart. A 2024 study found daily marijuana use increase heart attack risk by 25% and stroke risk by 42%. 4 Chronic marijuana use may increase your risk of cardiovascular problems. LIGHTFIELD STUDIOS – 'The public (and the medical field) should view cannabis and THC itself as products that are not without health risks,' Springer told Newsweek. 'THC seems to have some beneficial effects also, so there needs to be a balance between risk and benefit that is best decided with both eyes open,' he added. Research suggests that marijuana has the potential to ease chronic pain and reduce muscle spasms and stiffness linked to MS. Advertisement Cannabis products have also been shown to boost appetite in HIV/AIDS and cancer patients, and combat chemo-related nausea. Other potential benefits include easing stress, alleviating PTSD symptoms and aiding sleep in some people. 4 Research suggests that marijuana may help alleviate symptoms linked to several chronic health conditions. contentdealer – Springer and Mohammadi are calling for longer, larger studies to pun down exactly how marijuana and THC affect heart health — and to find out if there's a safe level of use. Advertisement The study comes as more Americans are using marijuana regularly than ever before. While alcohol is still more widely used overall, heavy marijuana use beat out heavy drinking for the first time in 2022, according to Carnegie Mellon researchers. That year, about 17.7 million Americans used cannabis daily or near-daily — compared to 14.7 million who drank that often. It marks a staggering 15-fold jump in chronic cannabis use since 1992. Advertisement Marijuana remains illegal federally, but 38 states and DC have legalized it for medical use. Of those, 24 states and DC have also cleared the way for adults 21 and over to use it recreationally. The recent legalization efforts have sparked a boom in cannabis use. In 2024, 47% of Americans said they'd tried marijuana at least once — up from 34% in 1999, according to Gallup polling.

Prime numbers, the building blocks of mathematics, have fascinated for centuries − now technology is revolutionizing the search for them
Prime numbers, the building blocks of mathematics, have fascinated for centuries − now technology is revolutionizing the search for them

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time20 hours ago

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Prime numbers, the building blocks of mathematics, have fascinated for centuries − now technology is revolutionizing the search for them

A shard of smooth bone etched with irregular marks dating back 20,000 years puzzled archaeologists until they noticed something unique – the etchings, lines like tally marks, may have represented prime numbers. Similarly, a clay tablet from 1800 B.C.E. inscribed with Babylonian numbers describes a number system built on prime numbers. As the Ishango bone, the Plimpton 322 tablet and other artifacts throughout history display, prime numbers have fascinated and captivated people throughout history. Today, prime numbers and their properties are studied in number theory, a branch of mathematics and active area of research today. Informally, a positive counting number larger than one is prime if that number of dots can be arranged only into a rectangular array with one column or one row. For example, 11 is a prime number since 11 dots form only rectangular arrays of sizes 1 by 11 and 11 by 1. Conversely, 12 is not prime since you can use 12 dots to make an array of 3 by 4 dots, with multiple rows and multiple columns. Math textbooks define a prime number as a whole number greater than one whose only positive divisors are only 1 and itself. Math historian Peter S. Rudman suggests that Greek mathematicians were likely the first to understand the concept of prime numbers, around 500 B.C.E. Around 300 B.C.E., the Greek mathematician and logician Euler proved that there are infinitely many prime numbers. Euler began by assuming that there is a finite number of primes. Then he came up with a prime that was not on the original list to create a contradiction. Since a fundamental principle of mathematics is being logically consistent with no contradictions, Euler then concluded that his original assumption must be false. So, there are infinitely many primes. The argument established the existence of infinitely many primes, however it was not particularly constructive. Euler had no efficient method to list all the primes in an ascending list. In the middle ages, Arab mathematicians advanced the Greeks' theory of prime numbers, referred to as hasam numbers during this time. The Persian mathematician Kamal al-Din al-Farisi formulated the fundamental theorem of arithmetic, which states that any positive integer larger than one can be expressed uniquely as a product of primes. From this view, prime numbers are the basic building blocks for constructing any positive whole number using multiplication – akin to atoms combining to make molecules in chemistry. Prime numbers can be sorted into different types. In 1202, Leonardo Fibonacci introduced in his book 'Liber Abaci: Book of Calculation' prime numbers of the form (2p - 1) where p is also prime. Today, primes in this form are called Mersenne primes after the French monk Marin Mersenne. Many of the largest known primes follow this format. Several early mathematicians believed that a number of the form (2p – 1) is prime whenever p is prime. But in 1536, mathematician Hudalricus Regius noticed that 11 is prime but not (211 - 1), which equals 2047. The number 2047 can be expressed as 11 times 89, disproving the conjecture. While not always true, number theorists realized that the (2p - 1) shortcut often produces primes and gives a systematic way to search for large primes. The number (2p – 1) is much larger relative to the value of p and provides opportunities to identify large primes. When the number (2p - 1) becomes sufficiently large, it is much harder to check whether (2p - 1) is prime – that is, if (2p - 1) dots can be arranged only into a rectangular array with one column or one row. Fortunately, Édouard Lucas developed a prime number test in 1878, later proved by Derrick Henry Lehmer in 1930. Their work resulted in an efficient algorithm for evaluating potential Mersenne primes. Using this algorithm with hand computations on paper, Lucas showed in 1876 that the 39-digit number (2127 - 1) equals 170,141,183,460,469,231,731,687,303,715,884,105,727, and that value is prime. Also known as M127, this number remains the largest prime verified by hand computations. It held the record for largest known prime for 75 years. Researchers began using computers in the 1950s, and the pace of discovering new large primes increased. In 1952, Raphael M. Robinson identified five new Mersenne primes using a Standard Western Automatic Computer to carry out the Lucas-Lehmer prime number tests. As computers improved, the list of Mersenne primes grew, especially with the Cray supercomputer's arrival in 1964. Although there are infinitely many primes, researchers are unsure how many fit the type (2p - 1) and are Mersenne primes. By the early 1980s, researchers had accumulated enough data to confidently believe that infinitely many Mersenne primes exist. They could even guess how often these prime numbers appear, on average. Mathematicians have not found proof so far, but new data continues to support these guesses. George Woltman, a computer scientist, founded the Great Internet Mersenne Prime Search, or GIMPS, in 1996. Through this collaborative program, anyone can download freely available software from the GIMPS website to search for Mersenne prime numbers on their personal computers. The website contains specific instructions on how to participate. GIMPS has now identified 18 Mersenne primes, primarily on personal computers using Intel chips. The program averages a new discovery about every one to two years. Luke Durant, a retired programmer, discovered the current record for the largest known prime, (2136,279,841 - 1), in October 2024. Referred to as M136279841, this 41,024,320-digit number was the 52nd Mersenne prime identified and was found by running GIMPS on a publicly available cloud-based computing network. This network used Nvidia chips and ran across 17 countries and 24 data centers. These advanced chips provide faster computing by handling thousands of calculations simultaneously. The result is shorter run times for algorithms such as prime number testing. The Electronic Frontier Foundation is a civil liberty group that offers cash prizes for identifying large primes. It awarded prizes in 2000 and 2009 for the first verified 1 million-digit and 10 million-digit prime numbers. Large prime number enthusiasts' next two challenges are to identify the first 100 million-digit and 1 billion-digit primes. EFF prizes of US$150,000 and $250,000, respectively, await the first successful individual or group. Eight of the 10 largest known prime numbers are Mersenne primes, so GIMPS and cloud computing are poised to play a prominent role in the search for record-breaking large prime numbers. Large prime numbers have a vital role in many encryption methods in cybersecurity, so every internet user stands to benefit from the search for large prime numbers. These searches help keep digital communications and sensitive information safe. This article is republished from The Conversation, a nonprofit, independent news organization bringing you facts and trustworthy analysis to help you make sense of our complex world. It was written by: Jeremiah Bartz, University of North Dakota Read more: Planning the best route with multiple destinations is hard even for supercomputers – a new approach breaks a barrier that's stood for nearly half a century Why does nature create patterns? A physicist explains the molecular-level processes behind crystals, stripes and basalt columns Art and science illuminate the same subtle proportions in tree branches Jeremiah Bartz owns shares in Nvidia.

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