It’s not a strobe light at a nightclub, but data from our MAVEN spacecraft reveal that the Martian sky pulses in ultraviolet light at night. The results are bein… See More.
A recent column in The Atlantic magazine, “The Most Overhyped Planet in the Galaxy” implored the research community to expand its robotic exploration horizons beyond Mars. But despite arguments for rethinking what the article’s author, Marina Koren, terms the U.S.’ scientific “Mars monopoly” in favor of some of our solar system’s less-visited outer moons, scientific understanding of the Red Planet is arguably still decades away.
Rest assured, Mars should and will remain a scientific Valhalla for decades to come.
The researchers fused machine learning from demonstration algorithms and more classical autonomous navigation systems. Rather than replacing a classical system altogether, APPLD learns how to tune the existing system to behave more like the human demonstration. This paradigm allows for the deployed system to retain all the benefits of classical navigation systems—such as optimality, explainability and safety—while also allowing the system to be flexible and adaptable to new environments, Warnell said.
In the future, a soldier and a game controller may be all that’s needed to teach robots how to outdrive humans.
At the U.S. Army Combat Capabilities Development Command’s Army Research Laboratory and the University of Texas at Austin, researchers designed an algorithm that allows an autonomous ground vehicle to improve its existing navigation systems by watching a human drive. The team tested its approach—called adaptive planner parameter learning from demonstration, or APPLD—on one of the Army’s experimental autonomous ground vehicles.
Continue reading “Soldiers could teach future robots how to outperform humans” »
All kinds of fascinating discoveries are likely lying in wait for us in the deep sea. Now scientists have pulled a new monster out of the waters off the coast of Indonesia. The creature is a new species of “supergiant” isopod, a huge marine relative of the common pillbug.
The discovery was made during the South Java Deep Sea Biodiversity Expedition 2018 (SJADES 2018). At depths between 950 and 1,260 m (3,115 and 4,135 ft), the team found two specimens of giant isopods that were soon determined to belong to a new species.
Named Bathynomus raksasa, the holotype, or physical specimen that serves as the basis for the description and name of the new species, is a male that was measured to be 36.3 cm (14.3 in) long, which puts it among the largest giant isopods ever found. The second specimen was a female measuring 29.8 cm (11.7 in). Along with being bigger on average, the team noted other differences when compared to the closest known species, Bathynomus giganteus, including smoother “skin” and different body proportions and shapes.
The 19 hospitalized patients from a single nursing home had tested positive for the virus in April.
All were older than age 64 and had chronic health conditions such as hypertension, dementia, heart disease, diabetes and lung diseases. Their age and health issues are considered risk factors for severe COVID-19.
The patients received either one or two intravenous doses of itolizumab along with the standard treatments used in Cuba at the time. Those included antiviral drugs, antibiotics, chloroquine, interferon, and blood thinners. Only two patients required oxygen therapy after the first dose, and all but one were discharged from the hospital in 14 days.
N”(Reuters) — An antibody drug already being used against the coronavirus in Cuba decreased the risk of intensive care admission and death among nursing home residents with moderate COVID-19, according to a small study conducted in the island nation.
Continue reading “Antibody drug lowers risk of death in elderly COVID-19 patients: Cuban study” »
A campaign called Operation Skeleton Key has stolen source code, software development kits, chip designs, and more.
It would be heartening to think that cybersecurity has advanced since the 1990s, but some things never change. Vulnerabilities that some of us first saw in 1996 are still with us.
If you don’t believe me, just take a look at the news. Last month, Virginia-based cybersecurity firm GRIMM announced that they had found a vulnerability that affects many Netgear home WiFi routers. The cause? Outdated firmware that allows remote users to access the administrative systems in these routers.
If you think this exploit sounds like a 1990s-standard input overflow flaw, well done. That’s exactly what it is. As Nichols put it in his very detailed blog post: “1996 called, they want their vulnerability back.”
AMOLF researchers have presented a theory that describes the friction between biological filaments that are crosslinked by proteins. Surprisingly, their theory predicts that the friction force scales highly nonlinearly with the number of crosslinkers. The authors believe that cells use this scaling not only to stabilize cellular structures, but also to control their size. The new findings are important for the understanding of the dynamics of cellular structures such as the mitotic spindle, which pulls chromosomes apart during cell division.
Motor proteins versus frictional forces
Many cellular structures consist of long filaments that are crosslinked by motor proteins and non-motor proteins (see figure). These so-called cytoskeletal structures not only give cells their mechanical stability, but also enable them to crawl over surfaces and to pull chromosome apart during cell division. Force generation is typically attributed to motor proteins, which, using chemical fuel, can move the filaments with respect to one another. However, these motor forces are opposed by frictional forces that are generated by passive, non–motor proteins. These frictional forces are a central determinant of the mechanical properties of cytoskeletal structures, and they limit the speed and efficiency with which these structures are formed. Moreover, they can even be vital for their stability, because if the motor forces are not opposed by the friction forces generated by the passive crosslinkers, the structures can even fall apart.
