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Gigantic 'shark-toothed' dinosaur discovered in Uzbekistan – Livescience.com

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An illustration of the “shark-toothed” dinosaur Ulughbegsaurus uzbekistanensis, who lived in what is now Uzbekistan about 90 million years ago. (Image credit: Julius Csotonyi)

About 90 million years ago, a gigantic apex predator — a meat-eating dinosaur with serrated shark-like teeth — prowled what is now Uzbekistan, according to a new study of the behemoth’s jawbone.

The 26-foot-long (8 meters) beast weighed 2,200 pounds (1,000 kilograms), making it longer than an African elephant and heavier than a bison. Researchers named it Ulughbegsaurus uzbekistanensis, after Ulugh Beg, a 15th-century astronomer, mathematician and sultan from what is now Uzbekistan.

What caught scientists by surprise was that the dinosaur was much larger — twice the length and more than five times heavier — than its ecosystem’s previously known apex predator: a tyrannosaur, the researchers found. 

Related: The 10 coolest dinosaur findings of 2020 

The chunk of jawbone was found in Uzbekistan’s Kyzylkum Desert in the 1980s, and researchers rediscovered it in 2019 in an Uzbekistan museum collection.

The partial jawbone of U. uzbekistanensis is enough to suggest that the animal was a carcharodontosaur, or a “shark-toothed” dinosaur. These carnivores were cousins and competitors of tyrannosaurs, whose most famous species is Tyrannosaurus rex

The two dinosaur groups were fairly similar, but carcharodontosaurs were generally more slender and lightly-built than the heavyset tyrannosaurs, said study co-researcher Darla Zelenitsky, an associate professor of paleobiology at the University of Calgary. Even so, carcharodontosaurs were usually larger than tyrannosaur dinosaurs, reaching weights greater than 13,200 pounds (6,000 kg). Then, around 90 million to 80 million years ago, the carcharodontosaurs disappeared and the tyrannosaurs grew in size, taking over as apex predators in Asia and North America. 

Two late Cretaceous dinosaur apex predators: a carcharodontosaur (left) and a tyrannosaur (right). (Image credit: Darla Zelenitsky)

The new finding is the first carcharodontosaur dinosaur discovered in Central Asia, the researchers noted. Paleontologists already knew that the tyrannosaur Timurlengia lived at the same time and place, but at 13 feet (4 m) in length and about 375 pounds (170 kg) in weight, Timurlengia was several times smaller than U. uzbekistanensis, suggesting that U. uzbekistanensis was the apex predator in that ecosystem, gobbling up horned dinosaurs, long-necked sauropods and ostrich-like dinosaurs in the neighborhood, the team said. 

“Our discovery indicates carcharodontosaurs were still dominant predators in Asia 90 million years ago,” study lead researcher Kohei Tanaka, an assistant professor at the Graduate School of Life and Environmental Sciences at the University of Tsukuba in Japan, told Live Science in an email.

An illustration of the enormous carcharodontosaur Ulughbegsaurus with the smaller tyrannosaur Timurlengia. (Image credit: Julius Csotonyi)

Peter Makovicky, a professor of paleontology at the University of Minnesota who was not involved in the study, agreed that U. uzbekistanensis was likely at the top of the local food chain. “I think this bone is so big that this would have been a very large predatory dinosaur and very likely the apex predator in its ecosystem,” Makovicky told Live Science. 

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This chunk of jawbone is all that paleontologists have of the ancient dinosaur.

This chunk of jawbone is all that paleontologists have of the ancient dinosaur Ulughbegsaurus. (Image credit: Tanaka et al 2021)
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This map shows where the dinosaur fossil was found in Uzbekistan.

This map shows where the Ulughbegsaurus fossil was found in Uzbekistan. (Image credit: Tanaka et al. 2021)
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A reconstruction of Ulughbegsaurus's upper jaw and teeth.

A reconstruction of Ulughbegsaurus’s upper jaw and teeth. (Image credit: Dinosaur Valley Studios)
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Study researchers Kohei Tanaka (left)and Darla Zelenitsky (right).

Study researchers Kohei Tanaka (left) and Darla Zelenitsky (right). (Image credit: University of Calgary)

The U. uzbekistanensis finding is the last known occurrence of a carcharodontosaur and a tyrannosaur living together before the carcharodontosaurs went extinct, the team said. The team found that U. uzbekistanensis has unique bony bumps above its teeth. However, it also has bony ridges on the sides of its jaw that were similar to the 79.5 million-year-old tyrannosaur Thanatotheristes degrootorum (whose name means “reaper of death“) from what is now Canada. It’s unclear why both species have these ridges, but perhaps it’s a case of convergent evolution, when species that aren’t closely related evolve to have similar characteristics, Zelenitsky said.

The study was published online Wednesday (Sept. 8) in the journal Royal Society Open Science.

Originally published on Live Science.

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Oldest human footprints in North America found in New Mexico – CTV News

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WASHINGTON —
Fossilized footprints discovered in New Mexico indicate that early humans were walking across North America around 23,000 years ago, researchers reported Thursday.

The first footprints were found in a dry lake bed in White Sands National Park in 2009. Scientists at the U.S. Geological Survey recently analyzed seeds stuck in the footprints to determine their approximate age, ranging from around 22,800 and 21,130 years ago.

The findings may shed light on a mystery that has long intrigued scientists: When did people first arrive in the Americas, after dispersing from Africa and Asia?

Most scientists believe ancient migration came by way of a now-submerged land bridge that connected Asia to Alaska. Based on various evidence — including stone tools, fossil bones and genetic analysis — other researchers have offered a range of possible dates for human arrival in the Americas, from 13,000 to 26,000 years ago or more.

The current study provides a more solid baseline for when humans definitely were in North America, although they could have arrived even earlier, the authors say. Fossil footprints are more indisputable and direct evidence than “cultural artifacts, modified bones, or other more conventional fossils,” they wrote in the journal Science, which published the study Thursday.

“What we present here is evidence of a firm time and location,” they said.

Based on the size of the footprints, researchers believe that at least some were made by children and teenagers who lived during the last ice age.

David Bustos, the park’s resource program manager, spotted the first footprints in ancient wetlands in 2009. He and others found more in the park over the years.

“We knew they were old, but we had no way to date the prints before we discovered some with (seeds) on top,” he said Thursday.

Made of fine silt and clay, the footprints are fragile, so the researchers had to work quickly to gather samples, Bustos said.

“The only way we can save them is to record them — to take a lot of photos and make 3D models,” he said.

Earlier excavations in White Sands National Park have uncovered fossilized tracks left by a saber-toothed cat, dire wolf, Columbian mammoth and other ice age animals.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

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Inspiration4 Lift Off: SpaceX Launches World’s First All-Citizen Mission in Earth’s Orbit – Illinoisnewstoday.com

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Tampa, Florida (WFLA) — SpaceX made history on Wednesday night when it launched the world’s first all-civil mission to get going from the Space Coast, Florida.

The Inspiration4 mission took off from Launch Complex 39A at NASA’s Kennedy Space Center around 8:03 pm on Wednesday. The four crew members on the SpaceX Dragon spacecraft were launched onto a reusable Falcon 9 rocket and later separated from the spacecraft and landed on the drone.

The mission’s five-hour launch window began at 8:02 EST. The window was very large, as the crew was sent to orbit the Earth rather than the International Space Station, and therefore did not have such strict time constraints.

The crew is set to travel 350 miles above the surface of the Earth, about 100 miles higher than the International Space Station.

“This is important and historic, because it’s the best time humans have been in orbit since the Hubble Space Telescope mission,” said Benjireed, SpaceX’s manned spaceflight director.

(Photo provided by SpaceX)

The crew will spend three days in orbit to participate in research experiments on human health and performance. We hope that the results of our research will apply not only to future space flight, but also to human health here on Earth.

Inspiration4’s main goal is to provide and inspire support for St. Jude Children’s Research Hospital. They want to raise $ 200 million for St. Jude in a three-day mission.

According to SpaceX, each of the four members of the crew was chosen to represent the pillars of a mission of prosperity, generosity, hope and leadership. The Inspiration 4 crew and the pillars they represent are:

  • leadership: 38 years old Jared Isaacman – Founder and CEO of Shift4Payments
  • Hope: 29-year-old Haley Arseno – Doctor assistants and childhood cancer survivors treated with St. Jude
  • Generosity: 41 years old Chris Sembroski – Lockheed Martin US Air Force veteran and aerospace employee
  • prosperity: 51 years old Dr. Cyan Proctor – Entrepreneurs, educators, trained pilots, and the active voice of the space exploration community

SpaceX trained all four crew members as commercial astronauts on Falcon 9 and Dragon spacecraft. The crew was trained in orbital mechanics, microgravity, weightlessness, other stress tests, emergency preparedness, and spacesuit training.

The mission was funded by Isaacman in a private transaction with SpaceX. Isaacman has also invested $ 100 million towards a funding target for the St. Jude mission.

Inspiration4 Lift Off: SpaceX Launches World’s First All-Citizen Mission in Earth’s Orbit

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'Flying' microchips could ride the wind to track air pollution – Yahoo Movies Canada

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Researchers have created a winged microchip around the size of a sand grain that may be the smallest flying device yet made, Vice has reported. They’re designed to be carried around by the wind and could be used in numerous applications including disease and air pollution tracking, according to a paper published by Nature. At the same time, they could be made from biodegradable materials to prevent environmental contamination. 

The design of the flyers was inspired by spinning seeds from cottonwood and other trees. Those fall slowly by spinning like helicopters so they can be picked up by the wind and spread a long distance from the tree, increasing the range of the species. 

The team from Northwest University ran with that idea but made it better, and smaller. “We think we’ve beaten biology… we’ve been able to build structures that fall in a more stable trajectory at slower terminal velocities than equivalent seeds,” said lead Professor John A. Rogers. “The other thing… was that we were able to make these helicopter flyer structures that are much smaller than seeds you would see in the natural world.”  

They’re not so small that the aerodynamics starts to break down, though. “All of the advantages of the helicopter design begin to disappear below a certain length scale, so we pushed it all the way, as far as you can go or as physics would allow,” Rogers told Vice. “Below that size scale, everything looks and falls like a sphere.”

The devices are also large enough to carry electronics, sensors and power sources. The team tested multiple versions that could carry payloads like antenna so that they could wireless communicate with a smartphone or each other. Other sensors could monitor things like air acidity, water quality and solar radiation. 

The flyers are still concepts right now and not ready to deploy into the atmosphere, but the team plans to expand their findings with different designs. Key to that is the use of biodegradable materials so they wouldn’t persist in the environment. 

“We don’t think about these devices… as a permanent monitoring componentry but rather temporary ones that are addressing a particular need that’s of finite time duration,” Rogers said. “That’s the way that we’re envisioning things currently: you monitor for a month and then the devices die out, dissolve, and disappear, and maybe you have to redeploy them.”

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