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The long-simmering Ebola outbreak in the Democratic Republic of the Congo entered a new and more ominous phase this week, with the cross-border spread of a handful of cases into western Uganda.
Why it matters: The cross-border spread puts more pressure on the World Health Organization to declare the nearly yearlong outbreak a public health emergency, which it has proven reluctant to do. A committee will meet Friday to determine whether to take that step.
But, but, but: The international spread of Ebola was expected by health experts given the proximity of the outbreak areas in the DRC to the heavily trafficked border with Uganda.
Details: This Ebola outbreak is already the second largest on record, and even the deployment of a successful vaccine has proven insufficient at arresting its spread. A key reason for this is the challenging security environment in which responders are operating.
Health workers in the DRC and Uganda are conducting ring vaccination campaigns using a vaccine supplied by Merck known as the rVSV-ZEBOV vaccine.
The impact: Given the continued increase in cases in the DRC and the potential for additional spread into neighboring countries, health officials have expressed concern that the vaccine supply may run out in the next few months.
What we’re watching: Unlike the 2014–2016 West Africa epidemic, this one has skirted below the radar of world leaders. The appointment of a high-level UN coordinator with extensive security experience has raised hopes of a more robust response.
The bottom line: On its present course, Morrison thinks the outbreak could persist for another 1–2 years. The longer it lasts, the greater the chance it has to reach major population centers.
Go deeper: Axios' complete Ebola outbreak coverage
Saturn's moon Daphnis as viewed through the planet's rings by the Cassini spacecraft. NASA/JPL-Caltech/Space Science Institute
New details of Saturn’s distinctive rings were revealed, using data from NASA's Cassini mission, Axios' Miriam Kramer reports. The new data was published in the journal Science this week.
Why it matters: The system of rings and moons around Saturn provides scientists a glimpse into the broader machinations of lunar and planetary formation in our solar system and beyond.
What they found: Various parts of Saturn's rings — which are largely made up of ice and dust — appear to have different textures, according to the new study.
Context: Saturn’s rings are thought to be younger than the planet itself and may have formed when a moon was ripped apart in orbit around the planet.
“[R]ing systems are best seen as temporary churning debris fields that are being swallowed up by their parent planets, rather than some stable, stationary feature.”— James O’Donoghue, planetary scientist at JAXA, tells Axios via email
Illustration: Rebecca Zisser/Axios
Two prominent teams of scientists recently announced that transposons — or "jumping genes" — can improve the precision of CRISPR gene editing, Axios' Eileen Drage O'Reilly reports.
Why it matters: While this research is still in the early stages, as both teams tested their techniques on bacterial cells, experts say the technique could allow edited genes to be more precisely inserted into genomes, possibly addressing concerns with current CRISPR systems that can lead to off-target editing and random deletions or even cancer.
Background: Transposons randomly jump from one site to the other, inserting genetic information as they go, using enzymes called transposases.
Details: Both studies essentially combine CRISPR with different transposons and, in the process, unveil details about how natural CRISPR systems have evolved and why there are a diverse number of systems.
Go deeper: Read the rest of Eileen's story
Earlier this year, we saw the unprecedented disappearance of sea ice from the Bering Sea during a time of year when it should be gaining ice. This trend toward plummeting sea ice in the Alaskan and Canadian Arctic continues, this time centered in the Chukchi and Beaufort seas.
Why it matters: Sea ice loss is disrupting the balance of heat in the Northern Hemisphere, and it is reverberating throughout ecosystems, causing everything from plankton blooms near the Arctic Ocean surface to mass haul-outs of walruses in Russia and Alaska. It may also be disrupting weather patterns across the Northern Hemisphere.
The big picture: Across the entire Arctic, sea ice extent is at a record low for this point in the year, and depending on weather conditions during the summer, it's possible that 2019 could set a new record low ice extent.
What they're saying: "At the moment, you can essentially sail uninterrupted from the North Pacific to the Canadian Arctic," says Zack Labe, a climate scientist and Ph.D. candidate at the University of California, Irvine.
"The Arctic is a regulator of Northern Hemisphere climate, and while the ice that is melting now isn't going to affect whether you get a thunderstorm tomorrow, in the long term, these are going to have profound effects on your weather and climate down the road that you will have to take action on, like it or not," says Rick Thoman of the University of Alaska at Fairbanks.
Illustration: Aïda Amer/Axios
NASA's murky commercial space future (Miriam Kramer)
Big Tech's timid deepfake defense (Kaveh Waddell)
How dengue, a deadly mosquito-borne disease, could spread in a warming world (Kendra Pierre-Louis and Nadja Popovich, New York Times)
Climate change is not causing wars yet (Nick Carne, Cosmos)
Where whales and plastic meet (Erica Cirino, Hakai Magazine)
Adrift in the Arctic (Sarah Kaplan, Washington Post)
Whole-body PET scanner produces 3D images in seconds (Sara Reardon, Nature News)
The topography of the far side of the Moon. The warmer colors indicate high areas, and the bluer colors indicate low regions. Dashed circle shows location of the mass anomaly. Image: NASA/Goddard Space Flight Center/University of Arizona
A mass of metal from an asteroid may lurk under a 1,200-mile-wide crater on the far side of the Moon, Miriam reports.
The big picture: A study published in the journal Geophysical Research Letters suggests that some of the material from the asteroid that created the Moon’s South Pole-Aitken Basin billions of years ago actually got stuck just under the crater, effectively weighing the floor of the basin down.
Details: Scientists found evidence of the possible asteroid pieces using data from NASA’s GRAIL mission, tasked with creating a gravitational map of the Moon to help scientists on Earth learn more about its structure.
But, but, but: It’s also possible that something else could cause the unexpected GRAIL readings around the basin. The material could also be from dense material thought to be the result of the Moon’s magma ocean solidifying, for example.
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