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More from News for Nerds -

Here comes the next 3D printer:

Physicists Detect Strongest Evidence Yet of Matter Generated By Collisions of Light (sciencealert.com)99

Posted by BeauHD on Wednesday August 11, 2021 @03:00AM from the highly-compelling-stuff dept.

omfglearntoplay shares a report from ScienceAlert: According to theory, if you smash two photons together hard enough, you can generate matter: an electron-positron pair, the conversion of light to mass as per Einstein's theory of special relativity. It's called the Breit-Wheeler process, first laid out by Gregory Breit and John A. Wheeler in 1934, and we have very good reason to believe it would work. But direct observation of the pure phenomenon involving just two photons has remained elusive, mainly because the photons need to be extremely energetic (i.e. gamma rays) and we don't have the technology yet to build a gamma-ray laser. Now, physicists at Brookhaven National Laboratory say they've found a way around this stumbling block using the facility's Relativistic Heavy Ion Collider (RHIC) -- resulting in a direct observation of the Breit-Wheeler process in action. The research has been published in the journal Physical Review Letters.

 

 

World's Strongest Glass That's As Hard As Diamond Discovered (independent.co.uk)152

Posted by BeauHD on Monday August 09, 2021 @10:20PM from the lost-and-found dept.

Hmmmmmm shares a report from The Independent: Scientists in China have developed the hardest and strongest glassy material known so far that can scratch diamond crystals with ease. The researchers, including those from Yanshan University in China, noted that the new material -- tentatively named AM-III -- has "outstanding" mechanical and electronic properties, and could find applications in solar cells due to its "ultra-high" strength and wear resistance. Analysis of the material, published in the journal National Science Review, revealed that its hardness reached 113 gigapascals (GPa) while natural diamond stone usually scores 50 to 70 on the same test.

According to the scientists, AM-III has tunable energy absorption properties comparable to semiconductors commonly used in solar cells such as hydrogenated amorphous silicon films. While in diamond crystals, the organized internal structure of its atoms and molecules contribute to their immense strength and hardness, in AM-III the researchers found that a combination of order and disorder of its molecules give rise to its strange properties. Using fullerenes, which are materials made of hollow football-like arrangements of carbon atoms, the researchers produced different types of glassy materials with varying molecular organization among which AM-III had the highest order of atoms and molecules. Increasing the order further, the scientists observed, could potentially kill the semiconductivity and other properties that required the atoms and molecules to be chaotic.

Why, yes, there IS something new in physics, thanks for asking.

An artist’s impression of Tcc+, a tetraquark composed of two charm quarks and an up and a down antiquark. Credit: CERN

The graphic, above, and the excerpt, below, are extracted from an article that was recently posted on Physics.org (link also included as "Physics News" in "4 FUN & ENLIGHTENMENT" in the right hand sidebar.

JULY 29, 2021

New exotic matter particle, a tetraquark, discovered

by CERN

Today, the LHCb experiment at CERN is presenting a new discovery at the European Physical Society Conference on High Energy Physics (EPS-HEP). The new particle discovered by LHCb, labeled as T_cc⁺, is a tetraquark—an exotic hadron containing two quarks and two antiquarks. It is the longest-lived exotic matter particle ever discovered, and the first to contain two heavy quarks and two light antiquarks.

Professor Nicholas Solomey

A friend in the physics department of Wichita State University received big-time publicity, this morning, at the top of the front page of The Wichita Eagle newspaper. I've previously posted about Nick's work with/on neutrinos and the grants that he has been awarded by NASA in Elusive Neutrino, in So far this week...., and probably in other postings long-since forgotten.

From later in the newspaper article, the writer says, "Current methods of studying neutrinos require building giant detectors in the hopes that a neutrino will interact with one of the particles in the detector and scientists can detect that interaction." Amusingly, the writer quotes another professor from Kansas State University, Tim Bolton [Director of the Deep Underground Neutrino Experiment (DUNE)], "...neutrino detectors tend to be very, very large. Basically these detectors are about the size of small naval warships.”

Nick's logic was that the difficult-to-detect but abundant neutrinos could be detected within a smaller chamber if that chamber were positioned much closer to the nearest great neutrino source, our sun - say 3 million miles away, the distance at which NASA has orbiting satellites that study the sun, where the neutrino density is about 1,000 times the density on earth.

Artist’s depiction of what a future mission using Solomey’s detector might look like. NASA

More from News for Nerds - High-res photo of a crystal

Image shows an electron ptychographic reconstruction of a praseodymium orthoscandate (PrScO₃) crystal, zoomed in 100 million times. Credit: Cornell University

From News for Nerds:

See the Highest-Resolution Atomic Image Ever Captured (scientificamerican.com)38

Posted by BeauHD on Tuesday June 29, 2021 @09:00AM from the record-breaking dept.

An anonymous reader quotes a report from Scientific American: Behold the highest-resolution image of atoms ever seen. Cornell University researchers captured a sample from a crystal in three dimensions and magnified it 100 million times, doubling the resolution that earned the same scientists a Guinness World Record in 2018. Their work could help develop materials for designing more powerful and efficient phones, computers and other electronics, as well as longer-lasting batteries. The researchers obtained the image using a technique called electron ptychography. It involves shooting a beam of electrons, about a billion of them per second, at a target material. The beam moves infinitesimally as the electrons are fired, so they hit the sample from slightly different angles each time -- sometimes they pass through cleanly, and other times they hit atoms and bounce around inside the sample on their way out. Cornell physicist David Muller, whose team conducted the recent study, likens the technique to playing dodgeball against opponents who are standing in the dark. The dodgeballs are electrons, and the targets are individual atoms. Though Muller cannot see the targets, he can see where the "dodgeballs" end up, thanks to advanced detectors. Based on the speckle pattern generated by billions of electrons, machine-learning algorithms can calculate where the atoms were in the sample and what their shapes might be.

Previously, electron ptychography had only been used to image extremely flat samples: those merely one to a few atoms thick. The new study, published in Science, now allows it to capture multiple layers tens to hundreds of atoms thick. That makes the technique much more relevant to materials scientists, who typically study the properties of samples with a thickness of about 30 to 50 nanometers. (That range is smaller than the length your fingernails grow in a minute but many times thicker than what electron ptychography could image in the past.) "They can actually look at stacks of atoms now, so it's amazing," says Andrew Maiden, an engineer at the University of Sheffield in England, who helped develop ptychography but was not involved with the new study. "The resolution is just staggering."

 

By visiting the Materials Project website, one may access an interactive presentation of the PrScO₃ crystal. As demonstrated in the screenshot, below, PrScO₃ is "Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Pr3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pr-O bond distances ranging from 2.37-2.89 Å. Sc3+ is bonded to six O2- atoms to form corner-sharing ScO6 octahedra."

Gee. I wish that website had been around when I studied crystallography in a solid state physics class (1958). It took me "forever" to figure out the primitive cell of the crystal assigned to me - iron alpha.

Refueling by drone

It's been 34 years since I was mustered out of the US Navy Reserve; but, Hunky Husband makes sure I keep somewhat in touch with what's happening with the Navy by asking frequent Navy-related questions - usually about ships or boats, expecting anyone with any affiliation to know all about them. Of course, I was a part of NAVAIR.

HH had a special interest in the article from which the following excerpts were taking. The drone involved is from Boeing - his home-away-from-home for 35 years.

Fueling the Future: MQ-25 first to conduct unmanned aerial tanking

07 June 2021

From NAVAIR Public Affairs

​​​​​​​NAVAL AIR SYSTEMS COMMAND, PATUXENT RIVER, Md. - The MQ-25™ program successfully conducted the first ever aerial refueling operations between a manned receiver aircraft and unmanned tanker June 4 from MidAmerica Airport in Mascoutah, Illinois.

....

During the flight, the receiver Navy F/A-18 Super Hornet approached the Boeing-owned MQ-25 T1 test asset, conducted a formation evaluation, wake survey, drogue tracking and then plugged with the unmanned aircraft. T1 then successfully transferred fuel from its Aerial Refueling Store (ARS) to the F/A-18.

....

 

The US Navy posted a 30-second video on Twitter.

 

The photo, below, and a 2:05 minute video are posted on the Boeing Media Room webpage.

 

So far this week....

So far this week there have been two things keeping me occupied: nursing Hunky Husband and dealing with a request from the Wichita State University Foundation concerning the small physics scholarship that HH and I have funded at WSU. The WSU Foundation wished to change one of the guidelines that we had established for our fund. Before answering the request, I conferred by email with a friend on the physics faculty, Professor Nicholas Solomey (Nick). I ended up denying the WSU Foundation's request for the change while conceding to an exception that would allow another (newish) physics faculty member to use the Summer 2021 expenditure from our fund for a non-complying graduate student. To change the guideline would have been to instantly thwart the original intent which was to lure new graduate students to WSU for their physics research program.

Heads up: If you are queasy about seeing scrapes/cuts/bloody sites, please do not scroll down to the end of this posting.

Physics

In exchanging emails with Nick, I learned that his wife's mother (who has lived with them since she was my age, five years ago) had emergency surgery last November. She had returned from the hospital with COVID-19, promptly sharing it with the family. Fortunately, no one succumbed to their bout with the virus and Nick wrote, "Covid-19 is the worst 2 weeks ever in bed every symptom of flu for two solid weeks and 6 weeks to recover and from my sick bed I wrote the grant! Someday I should reread it and see what delusions I said but too scared! Best just to work hard over next two years to get this done." NASA's announcement of the grant to which Nick referred is given, below. The graphics are from previous proposals that Nick had written to get him into Phases I and II of research under the NIAC grant program.

NASA encourages researchers to develop and study unexpected approaches for traveling through, understanding, and exploring space. To further these goals, the agency has selected seven studies for additional funding – totaling $5 million – from the NASA Innovative Advanced Concepts (NIAC) program. The researchers previously received at least one NIAC award related to their proposals.

“Creativity is key to future space exploration and fostering revolutionary ideas today that may sound outlandish will prepare us for new missions and fresh exploration approaches in the coming decades,” said Jim Reuter, associate administrator for NASA’s Space Technology Mission Directorate (STMD).

NASA selected the proposals through a peer-review process that evaluates innovation and technical viability. All projects are still in the early stages of development, with most requiring a decade or more of technology maturation. They are not considered official NASA missions.

Among the studies is a neutrino-detecting mission concept that will receive a $2 million Phase III NIAC grant to mature related technology over two years. Neutrinos are one of the most abundant particles in the universe but are challenging to study since they rarely interact with matter. Therefore, large and sensitive Earth-based detectors are best suited to detect them. Nikolas Solomey from Wichita State University in Kansas proposes something different: a space-based neutrino detector.

“Neutrinos are a tool to ‘see’ inside stars, and a space-based detector could offer a new window into the structure of our Sun and even our galaxy,” said NIAC Program Executive Jason Derleth. “A detector orbiting close to the Sun could reveal the shape and size of the solar furnace at the core. Or, by going in the opposite direction, this technology could detect neutrinos from stars at the center of our galaxy.”

Solomey’s previous NIAC research showed the technology could work in space, explored different mission flight paths, and developed an early prototype of the neutrino detector. With the Phase III grant, Solomey will prepare a flight-ready detector that could be tested on a CubeSat.

HH's Health

Hunky Husband had the unpleasant experience, Monday morning, of undergoing surgeries to remove both great toenails, and a hunk of scalp from the crown of his head. The toenail removals were the latest chapter in his continuing fight against fungus - a hard fight for a person who perspires as freely as does HH. The scalp removal was to rid him of a worrisome patch of skin that is potentially cancerous/pre-cancerous. I shant go into additional post-operative images. (In fact, I've taken no others. The above photo was taken to show HH the appearance of his surgical site.)

Attempting to nurse someone whose stubbornness would put a mule's to shame is not my idea of fun. It is an exercise in futility. That is especially true when said someone has memory issues and behavioral issues due to disease. I must say, though, that the hardest part of the whole thing for me was watching the repeated jabs of the needles injecting anesthetic under the toenails and under the scalp - knowing that HH has always hated needles. He was, understandably, not a happy camper.

Today, HH was feeling up to a walk - his first in several weeks. I'm sure that the walk was slow, for him; but, it was good for him, acknowledging that it would have been even better had he been willing to follow Dr Niederee's nurse's caution to stay off of his feet as much as possible for two or three days. (It was never destined to happen, despite her and my best efforts.)

With HH, there is no way he can go for a walk without having to shower afterward - it's that pesky copious perspiration to which I referred, above. (Fortunately for HH, the type of perspiration that he produces does not give him an odious odor even when he cannot shower!) He fared well. I put fresh bandages (large Band Aid-type bandages, cut to fit), another pair of clean, white socks, and a fresh pair of fleece-lined house shoes on his feet, and he was all sweet and clean.

Asimov & Heinlein would be proud at baby steps in robotics

If you watched today's 60 Minutes, you've seen Boston Dynamics' robots dancing the mashed potato and the twist. (The link to 60 Minutes leads to a page with a further link to tonight's show - a 13.5-minute video.)

For those who didn't catch the program, a 3-minute video is embedded, below. Sheer fun! BTW: The quadruped, Spot, is for sale for about 75K USD per copy. 

 

Next is a video with demos of gymnastics & useful work sequences.

 

 

Just to show that I don't play favorites, below is a 12-minute video that demonstrates capabilities of robots made by various companies.

 

 

Then, there's an update from News for Nerds.

Boston Dynamics' New Robot Doesn't Dance. It Has a Warehouse Job (wired.com)51

Posted by msmash on Monday March 29, 2021 @04:41PM from the closer-look dept.

It can't do back flips like Atlas the humanoid robot, nor can it dance or open doors for its friends, like Spot the robotic dog can. Instead, Boston Dynamics' new robot, named Stretch, is going straight to work in a warehouse. Wired:Rolling around on a wheeled base, it's basically a large robotic arm that grabs boxes using vacuum power, and it's designed for tasks like unloading trucks or stacking pallets. If Spot and Atlas are the show-offs in the family, Stretch is the straight-up workhorse. But while these machines all look and move in wildly different ways, they actually share a lot of DNA. Stretch may seem familiar to you, because it's a sort of descendant of another machine that debuted a few years back: Handle. That robot had a similar suction arm, but it balanced on two wheels, like a Segway scooter. Handle would grab a box, scoot backward, turn 90 degrees, and roll away to stack the box somewhere else. It looked neat on video, but in practice the robot needed a lot of room to operate. It could manage unloading boxes from a truck, sure. "But it took a long time," says Kevin Blankespoor, lead of warehouse robotics at Boston Dynamics. "The truck is a pretty confined space. And so for Handle, every time it grabbed the box, it would need to roll back into some space where it could rotate freely without collisions."

Which is all to say: If Handle were a human, it'd be let go. So Boston Dynamics pivoted (sorry) to a new form factor for Stretch that slapped a similar robotic vacuum arm on a base with four wheels. Each wheel can move independently, so the robot can shift side to side or forward and backward to orient itself in, say, the back of a truck. This new base granted Stretch two powers. For one thing, resting on four wheels is a whole lot more energy efficient than trying to constantly balance on two. The same is true for animals: A dog or cat is inherently more stable than a human. (Stretch will get 8 hours of battery life, and clients will have the option to upgrade to a double battery that holds 16 hours of charge.) The second advantage is that Stretch's arm can now pivot around its base, while Handle had to pivot its whole body to turn. Stretch can shift up to 800 boxes an hour.

Tidbits for another week - 3/12/2021

Electrical Problems (3/10/2021):

We have overkill in my kitchen: There are four ovens in it. Since I'm not much of a cook (I only cook to keep us from starving), you may not think that logical. However, the number of ovens in my kitchen is not the point of my sad tale. The point is that I had an electrical problem with the small toaster oven (to left of microwave on the counter in the photo, above) which proved to the world that I, who completed a minor in Electrical Engineering back in the late 1950s, am an idiot.

I wanted to toast a sandwich bun for our dinner, last night. I put the bun in the toaster oven, set the controls and started the oven, and left the room. Upon my return, I discovered that the oven was not hot, did not even have glowing digital control numbers showing. I unplugged the unit, re-plugged it. (That's the plug to the toaster oven at the right end of the toaster oven and above it. The other plug to the left of the toaster oven is actually the plug to the microwave.) Nothing. Exasperated, I used a skillet and the range top to toast the bun. As I went downstairs to bed, last night, I took the toaster oven down to our workshop where I intended to check it, later, to see if there is a fuse inside the casing.

This morning, as I came upstairs, I brought our standby toaster oven up from the basement. Later, I stuck a bagel into the standby toaster oven and set its simple mechanical controls. I listened to the hum of the spring-loaded timer as I walked away. When I returned, did I find a toasted bagel? Nope. The toaster oven was (electrically) dead as a doornail. Bah! Humbug! The poor thing had served me well in Albuquerque in the 1980s and had served me well for the first 10 years after my return to Derby KS; but, it hadn't been used since about 2000 - at which time it had been replaced by the newer unit.

A bit later, after working in the yard and kicking back thinking to take a short nap, my idle mind realized what was going on with the little ovens: I had been checking the wrong ground fault interrupter (GFI) unit. I had checked the GFI into which the microwave is plugged. That's logical since it is, physically, the nearest GFI unit to the outlet into which the toaster oven is plugged. However, the electrical outlet into which the toaster oven plugs is actually wired into the GFI unit of the outlet that is to the right of the microwave. Duh!

While everyone is looking at the photo of the ovens, please note that the little woodwork one can see is nice and clean. I started on spring cleaning, in the kitchen, the other day. It took me four days to finish scrubbing all of the cabinets in the kitchen, but they are clean!

Terminology Illuminated (3/12/2021):

The other day I asked that anyone who understood "Lie group" and/or "surfaces of ignorance" let me know so that I could share the Zoom login information to yesterday's Wichita State University Physics Seminar. I needed someone to watch and translate for me. The seminar featured Dr. Shannon Ray, National Research Council Fellow, Air Force Research Laboratory, speaking on“The Purification of 3-Level Quantum States and Surfaces of Ignorance”.

No one took me up on the challenge of translating for me, so I watched the presentation, alone. It turned out to be an interesting talk. Although I understood the math (heavy on tensor algebras), there was a lot of what turned out to be jargon - much of it invented by the presenter and his colleagues. One term that he used in a peripheral comment turned out to be less esoteric than I had perceived or considered: it was "The Bottom Turtle".

In exchanging emails with Ole Phat Stu, a few minutes ago, I was inspired to research "The Bottom Turtle". *Face Palm*  The term is from Yertle the Turtle by Dr Seuss.

Seuss (Theodor Seuss Geisel) has been in the news, much, of late - at least, here in the States. Fortunately, Yertle the Turtle was not implicated in the loud complaints against some of the Seuss books. Who knew it would contain an allegory during a physics talk? Whoo boy.

Personal Tidbits from Hunky Husband and me:

As of Wednesday (3/10/2021), Hunky Husband and I are considered by the Centers for Disease Control and Prevention to be "fully vaccinated". We may now meet with a few other people who are also "fully vaccinated", indoors, without masking and distancing. Unfortunately, in our family, being "fully vaccinated" has skipped the generation of our daughters. We are looking forward to their attaining the designation no later than the end of May.

On Friday (3/12/2021), HH & I met with our tax guy. Yikes! HH had, without my having noticed it, until we gathered our tax papers, chosen to skip the Required Minimum Distribution (RMD) from his Volunteer Investment Plan (VIP) with Boeing, for 2020. The problem that it presented for our 2020 taxes was that by not taking his RMD (not required in 2020 because of COVID-19), he did not contribute the taxes that he would have had withheld from the distribution.

For 2020, we had under-withheld (Fed & State) by an amount equal to my income from retirement benefits plus social security. (Of course, for 2019 we had over-withheld 1.2 times that much.) HH had left home without his checkbook, so the rest of our taxes will be automatically syphoned off of my checking account.  Fortunately, I am in the habit of carrying a blank check in my wallet and Robert was able to get the routing information off of it to give the Feds and the State Revenuers. (The minute we got home I transferred the funds from my savings. In the meantime, HH had received texts from H&R Block informing him that both sets of taxes had been accepted and would be deducted from the indicated account.)

 

More from News for Nerds - Computers, eyes, & antennae

Light-Based Quantum Computer Exceeds Fastest Classical Supercomputers (scientificamerican.com) 6

Posted by BeauHD on Friday December 04, 2020 @08:00AM from the far-too-complicated dept.

An anonymous reader quotes a report from Scientific American: For the first time, a quantum computer made from photons -- particles of light -- has outperformed even the fastest classical supercomputers. Physicists led by Chao-Yang Lu and Jian-Wei Pan of the University of Science and Technology of China (USTC) in Shanghai performed a technique called Gaussian boson sampling with their quantum computer, named Jiuzhang. The result, reported in the journal Science, was 76 detected photons -- far above and beyond the previous record of five detected photons and the capabilities of classical supercomputers.

Unlike a traditional computer built from silicon processors, Jiuzhangis an elaborate tabletop setup of lasers, mirrors, prisms and photon detectors. It is not a universal computer that could one day send e-mails or store files, but it does demonstrate the potential of quantum computing. Last year, Google captured headlines when its quantum computer Sycamore took roughly three minutes to do what would take a supercomputer three days (or 10,000 years, depending on your estimation method). In their paper, the USTC team estimates that it would take the Sunway TaihuLight, the third most powerful supercomputer in the world, a staggering 2.5 billion years to perform the same calculation as Jiuzhang. [...] This latest demonstration of quantum computing's potential from the USTC group is critical because it differs dramatically from Google's approach. Sycamore uses superconducting loops of metal to form qubits; in Jiuzhang, the photons themselves are the qubits. Independent corroboration that quantum computing principles can lead to primacy even on totally different hardware "gives us confidence that in the long term, eventually, useful quantum simulators and a fault-tolerant quantum computer will become feasible," Lu says.

... [T]he USTC setup is dauntingly complicated. Jiuzhang begins with a laser that is split so it strikes 25 crystals made of potassium titanyl phosphate. After each crystal is hit, it reliably spits out two photons in opposite directions. The photons are then sent through 100 inputs, where they race through a track made of 300 prisms and 75 mirrors. Finally, the photons land in 100 slots where they are detected. Averaging over 200 seconds of runs, the USTC group detected about 43 photons per run. But in one run, they observed 76 photons -- more than enough to justify their quantum primacy claim. It is difficult to estimate just how much time would be needed for a supercomputer to solve a distribution with 76 detected photons -- in large part because it is not exactly feasible to spend 2.5 billion years running a supercomputer to directly check it. Instead, the researchers extrapolate from the time it takes to classically calculate for smaller numbers of detected photons. At best, solving for 50 photons, the researchers claim, would take a supercomputer two days, which is far slower than the 200-second run time of Jiuzhang.

 

Reversal of Biological Clock Restores Vision In Old Mice (scitechdaily.com) 26

Posted by BeauHD on Friday December 04, 2020 @05:00AM from the epigenetic-reprogramming dept.

John Trumpian shares a report from SciTechDaily: Harvard Medical School scientists have successfully restored vision in mice by turning back the clock on aged eye cells in the retina to recapture youthful gene function. The team's work, described today in Nature, represents the first demonstration that it may be possible to safely reprogram complex tissues, such as the nerve cells of the eye, to an earlier age. In addition to resetting the cells' aging clock, the researchers successfully reversed vision loss in animals with a condition mimicking human glaucoma, a leading cause of blindness around the world.

The achievement represents the first successful attempt to reverse glaucoma-induced vision loss, rather than merely stem its progression, the team said. If replicated through further studies, the approach could pave the way for therapies to promote tissue repair across various organs and reverse aging and age-related diseases in humans. Sinclair and colleagues caution that the findings remain to be replicated in further studies, including in different animal models, before any human experiments. Nonetheless, they add, the results offer a proof of concept and a pathway to designing treatments for a range of age-related human diseases.

For their work, the team used an adeno-associated virus (AAV) as a vehicle to deliver into the retinas of mice three youth-restoring genes -- Oct4, Sox2 and Klf4 -- that are normally switched on during embryonic development. The three genes, together with a fourth one, which was not used in this work, are collectively known as Yamanaka factors. The treatment had multiple beneficial effects on the eye. First, it promoted nerve regeneration following optic-nerve injury in mice with damaged optic nerves. Second, it reversed vision loss in animals with a condition mimicking human glaucoma. And third, it reversed vision loss in aging animals without glaucoma.

 

 

SOURCE:  Arecibo Observatory, a U.S. National Science Foundation facility

Drone Footage Shows the Shocking Collapse of the Arecibo Observatory (theverge.com) 91

Posted by BeauHD on Thursday December 03, 2020 @05:40PM from the video-evidence dept.

Iwastheone shares a report from The Verge: Today, the National Science Foundation (NSF) released shocking footage of the collapse of the Arecibo Observatory in Puerto Rico. The video, captured on December 1st, shows the moment when support cables snapped, causing the massive 900-ton structure suspended above Arecibo to fall onto the observatory's iconic 1,000-foot-wide dish.

The videos of the collapse were captured by a camera located in Arecibo's Operations Control Center, as well as from a drone located above the platform at the time of collapse. The operator of the drone was able to adjust the drone camera once the platform started to fall and capture the moment of impact. NSF, which oversees Arecibo, had been doing hourly monitoring of the observatory with drones, ever since engineers warned that the structure was on the verge of collapsing in November. The footage highlights the moment when multiple cables snapped, causing the platform to swing outward and hit the side of the dish. The collapse also brought down the tops of the three support towers surrounding Arecibo, where the cables had been connected to keep the platform in the air. Slashdot reader joshgs shares a petition to rebuild the Arecibo Observatory. "On December 1, the platform of the 305-meter radio telescope at Arecibo Observatory suffered a catastrophic collapse," the petition states. "This telescope had many capabilities that cannot be replaced by any existing or planned facility. It had the world's most powerful and most sensitive planetary radar system, providing unparalleled capacity to track and characterize near-Earth asteroids. The telescope was also a source of tourism, education, and pride for the people of Puerto Rico, inspiring many to pursue careers in science and technology."

"We ask Congress to allocate funding to build a new Arecibo radio telescope with greater capabilities than the previous telescope -- to maintain American leadership in planetary defense, astronomy, and ionospheric studies; and to inspire a new generation of scientists."

It's the principle that counts

 In some recent year, I posted an imbedded  video showing a group of 300 men moving a rather large farm barn by lifting the barn and carrying it to the desired location. I can't find the posting. (That's what happens when I opt for not letting external search engines access my postings. The internal search engine - or my use of it - sucks.) Since I cannot find the previous posting, I'll embed the YouTube video one-more-once.

 

Below is the mechanized equivalent - the moving of a 5-story building in Shanghai.