On Frégate Island in the Seychelles, an archipelago off the coast of East Africa, researchers captured the first documented instance of a tortoise — usually a strict herbivore — hunting, killing and eating prey. The giant tortoise stalked a young noddy tern, which fell from its nest, for several minutes before biting and killing the bird.
Read more: https://www.sciencenews.org/ar....ticle/giant-tortoise
Video: Anna Zora (CC BY-NC-SA)
Removing a dam involves more than impressive explosions. Releasing a river like Washington state's Elwha transforms the landscape and restores important pathways for native fish. Read the full story at sciencenews.org: https://www.sciencenews.org/ar....ticle/dam-demolition
Engineers built a pair of dams along the Elwha about a century ago to capture its waters and provide hydropower to a nearby timber and paper mill operation. Both dams were recently dismantled as part of a broader push, across the United States and elsewhere, to remove aging dams. This video explores the removal of the dams on the Elwha River.
Narrator: With a bang — well, a series of them — the concrete fortresses of two giant dams holding back the Elwha River have come crumbling down. Dismantling the dams over the last few years in Washington State has been called the great Elwha Experiment. It’s a rare chance to watch what happens when a mighty river runs free once again, says Jeff Duda, a research ecologist at the U.S. Geological Survey.
Duda: There’ve been over a thousand dam removals in the United States, but the Elwha really stands out for a couple of reasons. One is the size of the dams. There were two large dams that were removed, just in terms of their height. The amount of sediment being released as part of the project is also unprecedented. And then the fact we’re standing in Olympic National Park and the majority of the watershed is protected as wilderness really is another facet of the project that really makes it one of a kind.
N: The two dams that came down were the Elwha Dam, which was finished in 1913 and stood 33 meters high, and the Glines Canyon Dam, which was completed in 1927 and was a towering 64 meters tall. They were built to provide electricity for a paper mill. They served their purpose. But they also disrupted salmons’ long swim up river to spawn. When the dams were constructed, ninety percent of the salmon habitat was cut off and the fish populations plummeted. Taking down the dams, however, is quickly correcting the population problem.
D: Connecting the upper river to the lower river and giving salmon the opportunity to recolonize their former spawning ground that they didn’t have access to for over a century is something we are really interested in learning about and understanding.
N: Duda says that salmon wriggled their way far up the river just after engineers blasted the final remnants of the Glines Canyon Dam. And already scientists are seeing nearly triple the number of salmon spawning nests downstream. There are other changes too. When the massive amounts of sediment trapped by the dams—enough to fill more than five Wembley stadiums—were released into the lower river, it settled into sandbars where new grasses and shrubs are starting to grow and reshape the river.
Remnants of the Glines Canyon Dam, however, still remain.
D: I think it will be a historical landmark as reminder of the history of this spot and the history the dams played in shaping the Elwha River.
Images and Video:
John Gussman, www.elwhafilm.com; Alexandra Witze;
Library of Congress, Wikimedia Commons, Public Domain
Reported by Alexandra Witze
Narrated and produced by Ashley Yeager
A new computer simulation hints that a spacecraft sent through a wormhole could phone home. #wormholes #space #physics #spacetime #science
Read more: https://www.sciencenews.org/ar....ticle/get-messages-s
Scriptwriter, host, producer - Maria Temming
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Reporter and fact checker - James R. Riordon
The extent of Arctic sea ice, which reaches its minimum each September (annual minimums are shown in the video), has declined dramatically since 1979. Read more: https://www.sciencenews.org/ce....ntury/climate-change
Video: NASA Scientific Visualization Studio
During Apollo 15, astronaut David Scott dropped a feather (in his left hand) and a hammer (in his right) to show that objects, regardless of mass, fall at the same rate in a vacuum.
Read more about artifacts of the Apollo missions: https://www.sciencenews.org/ar....ticle/apollo-astrona
"Mass effect relay - A mass Relay. Mass Relays are mass transit devices scattered across the Milky Way, usually located within certain star systems. They form an enormous galaxy-wide network enabling rapid interstellar travel." Mass Effect game
Original videos rights reserved by: @cbssf
Original song composed by Jack Wall and Sam Hulick for Bioware's video game, Mass Effect.
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Science News : एलोन मस्क (Elon Musk) के नेतृत्व वाली कंपनी ने अपने वाहन पर एक रूसी अंतरिक्ष यात्री लॉन्च किया है, जो नासा (NASA) और रोस्कोस्मोस (Roscosmos) के बीच एक विनिमय सौदे के हिस्से के रूप में आता है.
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Exploded stars, colliding galaxies, and beautiful clouds feature in the first space photos dropped by The James Webb Space Telescope July 12.
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Researchers captured E. coli bacteria in the act of becoming resistant to the antibiotic tetracycline. Some bacteria already contained a circular piece of DNA, called a plasmid, which carries antibiotic-resistance genes. Those resistant cells (green) pass the plasmid to sensitive cells (red). Once the plasmid has transferred (yellow dots), sensitive bacteria begin making proteins that make the microbes resistant to the antibiotic. The bacteria turn increasingly green as they become resistant to the antibiotic.
Read more: https://www.sciencenews.org/ar....ticle/bacteria-nearl
Video: Christian Lesterlin and Sophie Nolivos
Quantum entanglement is really weird — there’s nothing like it in our everyday experience. Particles maintain a mysterious link that persists even if the particles are separated by light-years. Einstein was famously not a fan of entanglement. Yet physicists are beginning to suspect that entanglement plays a central role in shaping the fabric of space and time that Einstein introduced in his general theory of relativity a century ago.
Read more: http://ow.ly/T0aKu
Story by Andrew Grant
Drawings by Helen Thompson
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Unlike other devices that could levitate only one object or move around particles as a group, a new device (left) uses ultrasonic waves to independently steer up to 25 millimeter-sized particles in different directions simultaneously (shown here manipulating six foam balls). The device (shown in a computer simulation on the right) uses two grids of ultrasonic speakers (rainbow-colored dots at top and bottom) to create sound fields between the speaker arrays. In these sound fields, particles get trapped in relatively quiet regions (black) between regions of high intensity sound (white).
Read more: https://www.sciencenews.org/ar....ticle/these-sound-wa
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A fleet of rockets, new hope for the Amazon, the future of our rivers and what AI holds in store for the future, are just some of the exciting video stories New Scientist plans to cover in 2023. As well as our usual daily feast of curiosities and newsworthy events.
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The universe was a cold, dark place 10 million years after the Big Bang. Hydrogen gas began to clump together 100 million years later, forming dense regions (white) that gave birth to the first stars and galaxies, as seen in this animation from a new simulation of the early universe. Light radiating from the stars (blue) heated the gas around the galaxies as matter collected in a weblike arrangement. The pink bursts are high-temperature regions that appeared as some stars exploded. The galaxies and stars we see today lie along the filaments that resulted from the complicated interplay between matter and starlight as the universe evolved.
Read more: https://www.sciencenews.org/ar....ticle/universe-evolu
Video: P. Ocvirk/Observatoire astronomique de Strasbourg, Paul Shapiro/The University of Texas at Austin/The Cosmic Dawn & CLUES Collaborations, Summit/Oak Ridge Leadership Computing Facility
Scientists reverse aging in mice using Yamanaka factors, suggesting potential for anti-aging treatment in humans.
Wondering how new elements end up on the periodic table? Let us explain.
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In todays video we will learn about the recent news of the discovery made by scientists on Jupiter. This planet is a true giant and because of its origins it has many interesting facts that we are just learning about.
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Ever wondered what the black hole at the center of the Milky Way looks like? Well, now we know.
Ready the original story: https://bit.ly/3Pwvcoy
Scriptwriters - Helen Thompson, Emily Conover
Story editor - Ashley Yeager
Reporters & fact checkers - Emily Conover & Liz Kruesi
Host - Helen Thompson
Images & video - EHT Collaboration, Koushik Chatterjee/BHI/Harvard, Liska et al. 2019, Caltech/MIT Haystack Observatory, Jeremy Schnittman/NASA Goddard, Center for Astrophysics l Harvard & Smithsonian, EHT Theory Working Group