Rare deep-sea squid filmed alive for first time
Scientists have captured the first-ever footage of the elusive Gonatus antarcticus squid alive in its deep-sea habitat. CNN's Jeremy Roth describes the rare encounter.
Try Our AI Features
Explore what Daily8 AI can do for you:
Comments
No comments yet...
Related Articles
Yahoo
11 hours ago
- Yahoo
PFAS exposure before birth could put your teen at risk for high blood pressure, study finds
Get inspired by a weekly roundup on living well, made simple. Sign up for CNN's Life, But Better newsletter for information and tools designed to improve your well-being. Prenatal exposure to a class of dangerous, widely used chemicals could be linked to your child having high blood pressure as a teen, according to a new study. Perfluoroalkyl and polyfluoroalkyl substances, or PFAS — sometimes called 'forever chemicals' because they don't fully break down in the environment — are a class of about 15,000 human-made chemicals linked to cancers, endocrine-related conditions and developmental problems in children. New data shows the synthetic compounds could also be linked to a teen's risk of developing cardiovascular disease later in life, according to the study published Thursday in the Journal of the American Heart Association. Researchers looked at data from 1,094 children over an average of 12 years. The study team compared measurements of eight types of PFAS chemicals in maternal plasma samples 24 to 72 hours after birth and the children's blood pressure from medical records, according to the study. The kids who were exposed to higher levels of PFAS chemicals in utero were more likely to have higher blood pressure in childhood and adolescence, the research found. The connection was particularly strong in adolescents, male children and Black children, said senior study author Dr. Mingyu Zhang, assistant professor of medicine at Harvard Medical School and Beth Israel Deaconess Medical Center. The study is observational, meaning that while it shows associations, it cannot prove that PFAS exposure is the cause of the elevated blood pressure, Zhang said. While researchers did adjust for other factors that could be at play, there could be other elements driving the connection between PFAS and blood pressure, he added. That said, the results are strong because this study is one of the largest and most diverse while also using rigorous methods, said Dr. Carmen Marsit, Rollins Distinguished Professor of Research at Emory University's Rollins School of Public Health in Atlanta. He was not involved in the research. The topic is important to investigate because if a child has high blood pressure, they are more likely to also have higher blood pressure later on, Zhang said. And that is a risk factor for cardiovascular disease, the No. 1 cause of death in the United States. The largest effects were shown in adolescents who were exposed to a mixture of different PFAS chemicals during pregnancy compared with those who were not, which implies that there may be a synergistic impact on cardiometabolic health, Marsit said. 'Most children will be exposed to multiple different PFAS chemicals, so this is worrisome,' he said. The fact that adolescence is the age when prenatal exposure to PFAS is most linked with higher blood pressure suggests that some of the PFAS chemicals could take a long period of time to show their impacts, Marsit said. A long latency of the effects would mean that people don't just need to worry about reducing exposures, but interventions also need to be developed to prevent the health outcomes in people who were exposed earlier, he added. Not only are PFAS forever chemicals –– they also are everywhere chemicals. Data from the National Health and Nutrition Examination Survey shows that this class of chemicals can be found in nearly every person in the United States, Marsit said in a previous CNN story. There are things you can do to reduce your exposure, however, he added. Major sources of exposure include food, water, and waterproof or stain-resistant items, Marsit said. Helpful steps include drinking filtered water –– using filters like those listed by the Environmental Working Group –– out of metal or glass containers, he said. Plastics contain PFAS and other toxic chemicals, Marsit said. A focus on fresh food can also help, as packaging for foods are often coated in PFAS chemicals, he added. And avoid using nonstick cookware, opting instead for metal, cast-iron or ceramic pots and pans, he said. Dusting, vacuuming, and washing your hands before eating or drinking can also reduce PFAS exposure, Marsit said. Healthy lifestyle choices can reduce the risk of high blood pressure for children who have been exposed to PFAS, Zhang said. 'These include maintaining a healthy weight, eating a balanced diet, reducing salt intake, and encouraging physical activity,' he added. But ultimately, an individual cannot solve PFAS exposure alone, Zhang said. 'We also need policy-level actions to limit and phase out PFAS use in products and industry, and to strengthen monitoring and regulation of PFAS in water systems,' he added.
CNN
a day ago
- CNN
Rare deep-sea squid filmed alive for first time
Scientists have captured the first-ever footage of the elusive Gonatus antarcticus squid alive in its deep-sea habitat. CNN's Jeremy Roth describes the rare encounter.
Yahoo
a day ago
- Yahoo
A ‘dragon prince' dinosaur is redrawing the tyrannosaur family tree
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Scientists have identified a previously unknown 86 million-year-old dinosaur species that fills an early gap in the fossil record of tyrannosaurs, revealing how they evolved to become massive apex predators. Researchers analyzing the species' remains have named it Khankhuuluu mongoliensis, which translates to 'dragon prince of Mongolia,' because it was small compared with its much larger relatives such as Tyrannosaurus rex, whose name means 'the tyrant lizard king.' The newly identified dinosaur was the closest known ancestor of tyrannosaurs and likely served as a transitional species from earlier tyrannosauroid species, according to the findings published Wednesday in the journal Nature. Based on a reexamination of two partial skeletons uncovered in Mongolia's Gobi Desert in 1972 and 1973, the new study suggests that three big migrations between Asia and North America led tyrannosauroids to diversify and eventually reach a gargantuan size in the late Cretaceous Period before going extinct 66 million years ago. 'This discovery of Khankhuuluu forced us to look at the tyrannosaur family tree in a very different light,' said study coauthor Darla Zelenitsky, associate professor within the department of Earth, energy, and environment at the University of Calgary, in an email. 'Before this, there was a lot of confusion about who was related to who when it came to tyrannosaur species. What started as the discovery of a new species ended up with us rewriting the family history of tyrannosaurs.' Tyrannosaurs, known scientifically as Eutyrannosaurians, bring to mind hulking dinosaurs like Tyrannosaurus rex and Tarbosaurus, which weighed multiple metric tons and could take down equally large prey. With short arms and massive heads, they walked on two legs and boasted sharp teeth, Zelenitsky said. But tyrannosaurs didn't start out that way. They evolved from smaller dinosaurs before dominating the landscapes of North America and Asia between 85 million and 66 million years ago, the researchers said. While Tarbosaurus, an ancestor of T. rex, clocked in at between 3,000 and 6,000 kilograms (6,613 pounds and 13,227 pounds), the fleet-footed Khankhuuluu mongoliensis likely weighed only around 750 kilograms (1,653 pounds), spanned just 2 meters (6.5 feet) at the hips and 4 meters (13 feet) in length, according to the study authors. Comparing the two dinosaurs would be like putting a horse next to an elephant —Khankhuuluu would have reached T. rex's thigh in height, Zelenitsky said. 'Khankhuuluu was almost a tyrannosaur, but not quite,' Zelenitsky said. 'The snout bone was hollow rather than solid, and the bones around the eye didn't have all the horns and bumps seen in T. rex or other tyrannosaurs.' Khankhuuluu mongoliensis, or a closely related ancestor species, likely migrated from Asia to North America across a land bridge between Alaska and Siberia that connected the continents 85 million years ago, Zelenitsky said. Because of this migrant species, we now know that tyrannosaurs actually evolved first on the North American continent and remained there exclusively over the next several million years, she said. 'As the many tyrannosaur species evolved on the continent, they became larger and larger.' Due to the poor fossil record, it's unclear what transpired in Asia between 80 million to 85 million years ago, she added. While some Khankhuuluu may have remained in Asia, they were likely replaced later on by larger tyrannosaurs 79 million years ago. Meanwhile, another tyrannosaur species crossed the land bridge back to Asia 78 million years ago, resulting in the evolution of two related but very different subgroups of tyrannosaurs, Zelenitsky said. One was a gigantic, deep-snouted species, while the other known as Alioramins was slender and small. These smaller dinosaurs have been dubbed 'Pinocchio rexes' for their long, shallow snouts. Both types of tyrannosaurs were able to live in Asia and not compete with each other because the larger dinosaurs were top predators, while Alioramins were mid-level predators going after smaller prey — think cheetahs or jackals in African ecosystems today, Zelenitsky said. 'Because of their small size, Alioramins were long thought to be primitive tyrannosaurs, but we novelly show Alioramins uniquely evolved smallness as they had 'miniaturized' their bodies within a part of the tyrannosaur family tree that were all otherwise giants,' Zelenitsky said. One more migration happened as tyrannosaurs continued to evolve, and a gigantic tyrannosaur species crossed back into North America 68 million years ago, resulting in Tyrannosaurus rex, Zelenitsky said. 'The success and diversity of tyrannosaurs is thanks to a few migrations between the two continents, starting with Khankhuuluu,' she said. 'Tyrannosaurs were in the right place at the right time. They were able to take advantage of moving between continents, likely encountering open niche spaces, and quickly evolving to become large, efficient killing machines.' The new findings support previous research suggesting that Tyrannosaurus rex's direct ancestor originated in Asia and migrated to North America via a land bridge and underscore the importance of Asia in the evolutionary success of the tyrannosaur family, said Cassius Morrison, a doctoral student of paleontology at University College London. Morrison was not involved in the new research. 'The new species provides essential data and information in part of the family tree with few species, helping us to understand the evolutionary transition of tyrannosaurs from small/ medium predators to large apex predators,' Morrison wrote in an email. The study also shows that the Alioramini group, once considered distant relatives, were very close cousins of T. rex. What makes the fossils of the new species so crucial is their age — 20 million years older than T. rex, said Steve Brusatte, professor and personal chair of Palaeontology and Evolution at the University of Edinburgh. Brusatte was not involved in the new study. 'There are so few fossils from this time, and that is why these scientists describe it as 'murky,'' Brusatte said. 'It has been a frustrating gap in the record, like if you suspected something really important happened in your family history at a certain time, like a marriage that started a new branch of the family or immigration to a new country, but you had no records to document it. The tyrannosaur family tree was shaped by migration, just like so many of our human families.' With only fragments of fossils available, it's been difficult to understand the variation of tyrannosaurs as they evolved, said Thomas Carr, associate professor of biology at Carthage College in Wisconsin and director of the Carthage Institute of Paleontology. Carr was not involved in the new research. But the new study sheds light on the dinosaurs' diversity and clarifies which ones existed when — and how they overlapped with one another, he said. More samples from the fossil record will provide additional clarity, but the new work illustrates the importance of reexamining fossils collected earlier. 'We know so much more about tyrannosaurs now,' Carr said. 'A lot of these historical specimens are definitely worth their weight in gold for a second look.' When the fossils were collected half a century ago, they were only briefly described at the time, Brusatte said. 'So many of us in the paleontology community knew that these Mongolian fossils were lurking in museum drawers, waiting to be studied properly, and apt to tell their own important part of the tyrannosaur story,' he said. 'It's almost like there was a non-disclosure agreement surrounding these fossils, and it's now expired, and they can come out and tell their story.'
