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Thu, 30 Sep 2021
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Laptop

New material could create 'neurons' and 'synapses' for computers

Proposed Device
© Illustration Banerjee group
Schematic of the proposed device structure for neuromorphic spintronic memristors. The write path is between the terminals through the top layer (black dotted line), the read path goes through the device stack (red dotted line). The right side of the figure indicates how the choice of substrate dictates whether the device will show deterministic or probabilistic behavior.
Classic computers use binary values (0/1) to perform. By contrast, our brain cells can use more values to operate, making them more energy-efficient than computers. This is why scientists are interested in neuromorphic (brain-like) computing. Physicists from the University of Groningen have used a complex oxide to create elements comparable to the neurons and synapses in the brain using spins, a magnetic property of electrons. Their results were published on 18 May in the journal Frontiers in Nanotechnology.

Although computers can do straightforward calculations much faster than humans, our brains outperform silicon machines in tasks like object recognition. Furthermore, our brain uses less energy than computers. Part of this can be explained by the way our brain operates: whereas a computer uses a binary system (with values 0 or 1), brain cells can provide more analogue signals with a range of values.

Cassiopaea

First nuclear detonation created 'impossible' quasicrystals

quasicrystal
© Luca Bindi, Paul J. Steinhardt
This sample of red trinitite was found to contain a previously unknown type of quasicrystal.
Scientists searching for quasicrystals — so-called 'impossible' materials with unusual, non-repeating structures — have identified one in remnants of the world's first nuclear bomb test.

The previously unknown structure, made of iron, silicon, copper and calcium, probably formed from the fusion of vaporized desert sand and copper cables. Similar materials have been synthesized in the laboratory and identified in meteorites, but this one, described in Proceedings of the National Academy of Sciences on 17 May, is the first example of a quasicrystal with this combination of elements1.

Impossible symmetries

Comment: One wonders what other effects these tests have had on our planet: See also:


Fireball

New meteor impact crater discovered on Mars

meteor crater mars
Meteors hit much harder on Mars than they do on the Earth. Lack of atmosphere obviously contributes to that, but its proximity to the asteroid belt also makes the red planet a more likely target for some gravitationally disturbed rock to run into. Now that we have a satellite infrastructure consistently monitoring Mars, we are able to capture the aftermath of what happens when it is pummeled by space debris, and the results can be dramatic.


One powerful tool in that impact hunting toolkit is the Mars Reconnaissance Orbiter (MRO). It has a variety of instruments on it that make it possible to both track down areas of interest and then follow up with high resolution imagery, incluidng HiRISE, the camera that took the picture above. That is exactly what happened with a new crater that the satellite noticed on one of its flybys.

Comment: Considering the above, it's notable that there's been a significant uptick of fireballs and NEOs recorded on Earth in recent years: Also check out SOTT radio's:


Syringe

The data suggest we achieved herd immunity before the vaccines were rolled out

cows cow confrontation
Summary
  • Population immunity played a major role in ending each wave of SAR-CoV-2 infection
  • Herd immunity thresholds differ by about two-fold across England, and have been reached
  • Different herd immunity thresholds correlate with regional differences in ethnicity and air temperature - possibly both operating by changing the rate of indoor contacts
  • The Infection Fatality Rate has changed dramatically during the pandemic: it first rose during (and possibly because of) lockdowns, and then fell by over eight-fold as older and vulnerable individuals were vaccinated. It is now so low, and herd immunity so well established, that vaccinating younger adults and children with novel genetic technology vaccines cannot be medically or ethically justified.

Magnet

Sharks use Earth's magnetic field as a GPS

bonnethead shark
© Colby Griffiths
Bryan Keller holds a bonnethead shark • North Edisto River, South Carolina
Sharks use the Earth's magnetic field as a sort of natural GPS to navigate journeys that take them great distances across the world's oceans, scientists have found. Researchers said their marine laboratory experiments with a small species of shark confirm long-held speculation that sharks use magnetic fields as aids to navigation — behavior observed in other marine animals such as sea turtles.

Their study, published this month in the journal Current Biology, also sheds light on why sharks are able to traverse seas and find their way back to feed, breed and give birth, said marine policy specialist Bryan Keller, one of the study authors.

"We know that sharks can respond to magnetic fields," Keller said. "We didn't know that they detected it to use as an aid in navigation ... You have sharks that can travel 20,000 kilometers (12,427 miles) and end up in the same spot."

The question of how sharks perform long-distance migrations has intrigued researchers for years. The sharks undertake their journeys in the open ocean where they encounter few physical features such as corals that could serve as landmarks.

Mars

Ivy League scientist says NASA may have accidentally spread life to Mars

Mars Lander
© NASA/UPI/Newscom/File
The robotic arm on NASA's Phoenix Mars Lander scooping Martian soil samples
Amid the latest exploration and search for life on Mars, a Cornell scientist wonders what kind of microbe humans could have accidentally "carried into space and survived the trip to make its new home on Mars."

Cornell University geneticist Christopher Mason wrote in an May 10 piece for the BBC that life discovered on the red planet might have actually originated on earth in NASA labs, despite thorough on-site cleaning procedures and spacecraft assembly in specialized rooms.

Spacecraft, like the Perseverance Rover, are built in meticulously sterilized rooms piece by piece with each component cleaned before being added. This should theoretically ensure that no bacteria or organism survives the assembly process, according to Mason.
"Filtration systems in the spartan rooms offer an extra layer of protection so only a few hundred particles can contaminate each square foot. But, it is almost impossible to get to zero biomass. Microbes have been on Earth for billions of years, and they are everywhere. They are inside us, on our bodies, and all around us. Some can sneak through even the cleanest of clean rooms."

Comment: A video combining drone Ingenuity and the Perseverance Rover in their current missions on Mars:




Ladybug

Einstein's thinking on bees, birds and their clues about physics, revealed in previously unknown letter

Einstein
© Dyer et al. 2021, J Comp Physiol A / The Hebrew University of Jerusalem
Letter by Albert Einstein, validated by The Hebrew University of Jerusalem, where Einstein bequeathed his notes, letters and records.
The 1949 letter by the physicist and Nobel laureate discusses bees, birds and whether new physics principles could come from studying animal senses.

It's a position still being realized within physics to this day, with a growing body of research and understanding of how animals such as birds and bees find their way around.

Now a study led by RMIT University in Melbourne, Australia, discusses how recent discoveries in migratory birds back up Einstein's thinking 72 years ago.

Comment: More recent, fascinating discoveries within the animal kingdom that reveal much more about the workings of our world: And check out SOTT radio's:


Mars

China's 1st Mars rover 'Zhurong' lands on the Red Planet

Tianwen-1 mars rover
© CCTV/China National Space Administration
An artist's concept of China's first Mars rover mission, Tianwen-1, at the Red Planet.
China just successfully landed its first rover on Mars, becoming only the second nation to do so.

The Tianwen-1 mission, China's first interplanetary endeavor, reached the surface of the Red Planet Friday (May 14) at approximately 7:11 p.m. EDT (2311 GMT), though Chinese space officials have not yet confirmed the exact time and location of touchdown. Tianwen-1 (which translates to "Heavenly Questions") arrived in Mars' orbit in February after launching to the Red Planet on a Long March 5 rocket in July 2020.

After circling the Red Planet for more than three months, the Tianwen-1 lander, with the rover attached, separated from the orbiter to begin its plunge toward the planet's surface. Once the lander and rover entered Mars' atmosphere, the spacecraft endured a similar procedure to the "seven minutes of terror" that NASA's Mars rovers have experienced when attempting soft landings on Mars.

A heat shield protected the spacecraft during the fiery descent, after which the mission safely parachuted down to the Utopia Planitia region, a plain inside of an enormous impact basin in the planet's northern hemisphere. Much like during NASA's Perseverance rover landing, Tianwen-1's landing platform fired some small, downward-facing rocket engines to slow down during the last few seconds of its descent.

The China National Space Administration (CNSA) has not yet officially confirmed the successful landing, but it has been announced on social media by the state-run China Global Television Network (CGTN) and by researchers at Macau University of Science and Technology in China.

Microscope 2

Covid-19 may insert itself into human genome, strongest evidence to date suggests

covid
Our genome is a graveyard littered with genetic fragments of viruses that once plagued our ancestors. If a controversial claim by MIT researchers withstands the criticisms being leveled at it, the virus behind the current pandemic has a fair chance of joining them.

Having a few chunks of virus code scattered among our genes doesn't necessarily mean the pandemic is here to stay. It could even go some way towards explaining why a handful of patients continue to test positive for COVID-19 long after recovery.

But SARS-CoV-2 simply isn't equipped with the tools to bury itself in our genetic library, meaning it would need a way to convince our own bodies to manage the job on its behalf.

Comment: For insight into the likely origins of the coronavirus and its workings, check out SOTT's Compelling Evidence That SARS-CoV-2 Was Man-Made

See also: The Inanity of RNA Vaccines For COVID-19


Clock

Measuring time accurately increases the entropy in the universe

world clock
© Bruce Rolff/Alamy
The most accurate clocks create the most disorder

Bruce Rolff/Alamy
Keeping time accurately comes with a price. The maximum accuracy of a clock is directly related to how much disorder, or entropy, it creates every time it ticks.

Natalia Ares at the University of Oxford and her colleagues made this discovery using a tiny clock with accuracy that can be controlled. The clock consisted of a 50-nanometre-thick membrane of silicon nitride, vibrated by an electric current. Each time the membrane moved up and down once and then returned to its original position, the researchers counted a tick, and the regularity of the spacing between the ticks represented the accuracy of the clock.

They found that as they increased the clock's accuracy, the heat produced in the system grew, increasing the entropy of its surroundings by jostling nearby particles. "If a clock is more accurate, you are paying for it somehow," says Ares.

In this case, you pay for it by pouring more ordered energy into the clock, which is then converted into entropy. "By measuring time, we are increasing the entropy of the universe," says Ares. The more entropy there is in the universe, the closer it may be to its eventual demise. "Maybe we should stop measuring time." The scale of the additional entropy is so small, though, that there's no need to worry, she says.