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10 Best Wireless Earbuds for Working Out (2023)
Fri, 17 Mar 2023 14:00:00 +0000
Rock your inner jock with a pair of sturdy, sweatproof, and tangle-proof headphones. Here are our favorites.
Match ID: 0 Score: 25.00 source: www.wired.com age: 4 days
qualifiers: 25.00 fitness
The truth about Gwyneth Paltrow’s diet? It is as strange as you’d expect | Arwa Mahdawi
Tue, 21 Mar 2023 14:50:24 GMT
The actor and influencer has been called out for glorifying restricted eating. What is it with the rich and their weird ideas about wellness?
This time there aren’t any vaginas involved. I say that because half the time Gwyneth Paltrow is in the news it’s vagina-related. On this occasion, however, it’s because a lot of people are seemingly annoyed that she – a woman who has amassed a fortune doling out strange and often suspect health advice via her lifestyle brand Goop – follows that advice herself.
The trouble started when Paltrow appeared on an episode of Dr Will Cole’s The Art of Being Well podcast and shared what she eats in a typical day. Which, no points for guessing, isn’t much. She doesn’t eat until about noon which, in normal-person-speak, means she skips breakfast. In wellness land it means she’s doing “a nice intermittent fast”. Then she has something that won’t spike her blood pressure, such as coffee. She often follows that up with “bone broth”. An hour of “movement” ensues, wrapped up with some vigorous dry brushing and the sauna. Finally: an early dinner. “I try to eat according to paleo,” she says. “So lots of vegetables. It’s really important for me to support my detox.” I’m sorry, detox? You can’t detox if there was never any tox in the first place.
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Dead, and in a jacket and tie. That’s how he was on 1 December 1948, when two men found him slumped against a retaining wall on the beach at Somerton, a suburb of Adelaide, Australia.
The Somerton Man’s body was found on a beach in 1948. Nobody came forward to identify him.
JAMES DURHAM
Police distributed a photograph, but no one came forward to claim the body. Eyewitnesses reported having seen the man, whom the newspapers dubbed the Somerton Man and who appeared to be in his early 40s, lying on the beach earlier, perhaps at one point moving his arm, and they had concluded that he was drunk. The place of death led the police to treat the case as a suicide, despite the apparent lack of a suicide note. The presence of blood in the stomach, a common consequence of poisoning, was noted at the autopsy. Several chemical assays failed to identify any poison; granted, the methods of the day were not up to the task.
The place on Somerton Beach where the man was found dead is marked with an X.
NEWS CORP./ALAMY
Policemen recovered the man’s suitcase from the Adelaide city railway station and examined its contents.
NEWS CORP./ALAMY
The man’s fingerprints, taken after autopsy, were sent to the U.S. Federal Bureau of Investigation, which found no match.
DEREK ABBOTT
There was speculation of foul play. Perhaps the man was a spy who had come in from the cold; 1948 was the year after the Cold War got its name. This line of thought was strengthened, a few months later, by codelike writings in a book that came to be associated with the case.
These speculations aside, the idea that a person could simply die in plain view and without friends or family was shocking. This was a man with an athletic build, wearing a nice suit, and showing no signs of having suffered violence. The problem nagged many people over the years, and eventually it took hold of me. In the late 2000s, I began working on the Somerton Man mystery, devoting perhaps 10 hours a week to the research over the course of about 15 years.
Throughout my career, I have always been interested in cracking mysteries. My students and I used computational linguistics to identify which of the three authors of The Federalist Papers—Alexander Hamilton, James Madison, and John Jay—was responsible for any given essay. We tried using the same method to confirm authorship of Biblical passages. More recently, we’ve been throwing some natural-language processing techniques into an effort to decode the Voynich Manuscript, an early 15th-century document written in an unknown language and an unknown script. These other projects yield to one or another key method of inquiry. The Somerton Man problem posed a broader challenge.
My one great advantage has been my access to students and to scientific instruments at the University of Adelaide, where I am a professor of electrical and electronic engineering. In 2009, I established a working group at the university’s Center for Biomedical Engineering.
One question surrounding the Somerton Man had already been solved by sleuths of a more literary bent. In 1949, a pathologist had found a bit of paper concealed in one of the dead man’s pockets, and on it were printed the words Tamám Shud, the Persian for “finished.” The phrase appears at the end of Edward FitzGerald’s translation of the Rubáiyát of Omar Khayyám, a poem that remains popular to this day.
The police asked the public for copies of the book in which the final page had been torn out. A man found such a book in his car, where apparently it had been thrown in through an open window. The book proved a match.
The back cover of the book also included scribbled letters, which were at first thought to constitute an encrypted message. But statistical tests carried out by my team showed that it was more likely a string of the initial letters of words. Through computational techniques, we eliminated all of the cryptographic codes known in the 1940s, leaving as a remaining possibility a one-time pad, in which each letter is based on a secret source text. We ransacked the poem itself and other texts, including the Bible and the Talmud, but we never identified a plausible source text. It could have been a pedestrian aide-mémoire—to list the names of horses in an upcoming race, for example. Moreover, our research indicates that it doesn’t have the structural sophistication of a code. The Persian phrase could have been the man’s farewell to the world: his suicide note.
Also scribbled on the back cover was a telephone number that led to one Jo Thomson, a woman who lived merely a five-minute walk from where the Somerton Man had been found. Interviewers then and decades later reported that she had seemed evasive; after her death, some of her relatives and friends said they speculated that she must have known the dead man. I discovered a possible clue: Thomson’s son was missing his lateral incisors, the two teeth that normally flank the central incisors. This condition, found in a very small percentage of the population, is often congenital; oddly, the Somerton Man had it, too. Were they related?
And yet the attempt to link Thomson to the body petered out. Early in the investigation, she told the police that she had given a copy of the Rubáiyát to a lieutenant in the Australian Army whom she had known during the war, and indeed, that man turned out to own a copy. But Thomson hadn’t seen him since 1945, he was very much alive, and the last page of his copy was still intact. A trail to nowhere, one of many that were to follow.
We engineers in the 21st century had several other items to examine. First was a plaster death mask that had been made six months after the man died, during which time the face had flattened. We tried several methods to reconstruct its original appearance: In 2013 we commissioned a picture by Greg O’Leary, a professional portrait artist. Then, in 2020, we approached Daniel Voshart, who designs graphics for Star Trek movies. He used a suite of professional AI tools to create a lifelike reconstruction of the Somerton Man. Later, we obtained another reconstruction by Michael Streed, a U.S. police sketch artist. We published these images, together with many isolated facts about the body, the teeth, and the clothing, in the hope of garnering insights from the public. No luck.
As the death mask had been molded directly off the Somerton Man’s head, neck, and upper body, some of the man’s hair was embedded in the plaster of Paris—a potential DNA gold mine. At the University of Adelaide, I had the assistance of a hair forensics expert, Janette Edson. In 2012, with the permission of the police, Janette used a magnifying glass to find where several hairs came together in a cluster. She was then able to pull out single strands without breaking them or damaging the plaster matrix. She thus secured the soft, spongy hair roots as well as several lengths of hair shaft. The received wisdom of forensic science at the time held that the hair shaft would be useless for DNA analysis without the hair root.
Janette performed our first DNA analysis in 2015 and, from the hair root, was able to place the sample within a maternal genetic lineage, or haplotype, known as “H,” which is widely spread around Europe. (Such maternally inherited DNA comes not from the nucleus of a cell but from the mitochondria.) The test therefore told us little we hadn’t already known. The concentration of DNA was far too low for the technology of the time to piece together the sequencing we needed.
Fortunately, sequencing tools continued to improve. In 2018, Guanchen Li and Jeremy Austin, also at the University of Adelaide, obtained the entire mitochondrial genome from hair-root material and narrowed down the maternal haplotype to H4a1a1a.
However, to identify Somerton Man using DNA databases, we needed to go to autosomal DNA—the kind that is inherited from both parents. There are more than 20 such databases, 23andMe and Ancestry being the largest. These databases require sequences of from 500,000 to 2,000,000 single nucleotide polymorphisms, or SNPs (pronounced “snips”). The concentration levels of autosomes in the human cell tend to be much lower than those of the mitochondria, and so Li and Austin were able to obtain only 50,000 SNPs, of which 16,000 were usable. This was a breakthrough, but it still wasn’t good enough to work on a database.
In 2022, at the suggestion of Colleen Fitzpatrick, a former NASA employee who had trained as a nuclear physicist but then became a forensic genetics expert, I sent a hair sample to Astrea Forensics, a DNA lab in the United States. This was our best hair-root sample, one that I had nervously guarded for 10 years. The result from Astrea came back—and it was a big flop.
Seemingly out of options, we tried a desperate move. We asked Astrea to analyze a 5-centimeter-long shaft of hair that had no root at all. Bang! The company retrieved 2 million SNPs. The identity of the Somerton Man was now within our reach.
So why did the rootless shaft work in our case?
The DNA analysis that police use for standard crime-solving relies on only 20 to 25 short tandem repeats (STRs) of DNA. That’s fine for police, who mostly do one-to-one matches to determine whether the DNA recovered at a crime scene matches a suspect’s DNA.
But finding distant cousins of the Somerton Man on genealogical databases constitutes a one-to-many search, and for that you typically need around 500,000 markers. For these genealogical searches, SNPs are used because they contain information on ethnicity and ancestry generally. Note that SNPs have around 50 to 150 base pairs of nucleotides, whereas typical STRs tend to be longer, containing 80 to 450 base pairs. The hair shaft contains DNA that is mostly fragmented, so it’s of little use when you’re seeking longer STR segments but it’s a great source of SNPs. So this is why crime forensics traditionally focused on the root and ignored the shaft, although this practice is now changing very slowly.
Another reason the shaft was such a trove of DNA is that keratin, its principal component, is a very tough protein, and it had protected the DNA fragments lodged within it. The 74-year-old soft spongy hair root, on the other hand, had not protected the DNA to the same extent. We set a world record for obtaining a human identification, using forensic genealogy, from the oldest piece of hair shaft. Several police departments in the United States now use hair shafts to retrieve DNA, as I am sure many will start to do in other countries, following our example.
Libraries of SNPs can be used to untangle the branching lines of descent in a family tree. We uploaded our 2 million SNPs to GEDmatch Pro, an online genealogical database located in Lake Worth, Fla. (and recently acquired by Qiagen, a biotech company based in the Netherlands). The closest match was a rather distant relative based in Victoria, Australia. Together with Colleen Fitzpatrick, I built out a family tree containing more than 4,000 people. On that tree we found a Charles Webb, son of a baker, born in 1905 in Melbourne, with no date of death recorded.
Charles never had children of his own, but he had five siblings, and I was able to locate some of their living descendants. Their DNA was a dead match. I also found a descendant of one of his maternal aunts, who agreed to undergo a test. When a positive result came through on 22 July 2022, we had all the evidence we needed. This was our champagne moment.
In late 2021, police in South Australia ordered an exhumation of the Somerton Man’s body for a thorough analysis of its DNA. At the time we prepared this article, they had not yet confirmed our result, but they did announce that they were “cautiously optimistic” about it.
All at once, we were able to fill in a lot of blank spaces. Webb was born on 16 November 1905, in Footscray, a suburb of Melbourne, and educated at a technical college, now Swinburne University of Technology. He later worked as an electrical technician at a factory that made electric hand drills. Our DNA tests confirmed he was not related to Thomson’s son, despite the coincidence of their missing lateral incisors.
We discovered that Webb had married a woman named Dorothy Robinson in 1941 and had separated from her in 1947. She filed for divorce on grounds of desertion, and the divorce lawyers visited his former place of work, confirming that he had quit around 1947 or 1948. But they could not determine what happened to him after that. The divorce finally came through in 1952; in those days, divorces in Australia were granted only five years after separation.
At the time of Webb’s death his family had become quite fragmented. His parents were dead, a brother and a nephew had died in the war, and his eldest brother was ill. One of his sisters died in 1955 and left him money in her will, mistakenly thinking he was still alive and living in another state. The lawyers administering the will were unable to locate Charles.
We got more than DNA from the hair: We also vaporized a strand of hair by scanning a laser along its length, a technique known as laser ablation. By performing mass spectrometry on the vapor, we were able to track Webb’s varying exposure to lead. A month before Webb’s death, his lead level was high, perhaps because he had been working with the metal, maybe soldering with it. Over the next month’s worth of hair growth, the lead concentration declined; it reached its lowest level at his death. This might be a sign that he had moved.
With a trove of photographs from family albums and other sources, we were able to compare the face of the young Webb with the artists’ reconstructions we had commissioned in 2013 and 2021 and the AI reconstruction we had commissioned in 2020. Interestingly, the AI reconstruction had best captured his likeness.
A group photograph, taken in 1921, of the Swinburne College football team, included a young Webb. Clues found in newspapers show that he continued to participate in various sports, which would explain the athletic condition of his body.
What’s interesting about solving such a case is how it relies on concepts that may seem counterintuitive to forensic biologists but are quite straightforward to an electronics engineer. For example, when dealing with a standard crime scene that uses only two dozen STR markers, one observes very strict protocols to ensure the integrity of the full set of STRs. When dealing with a case with 2 million SNPs, by contrast, things are more relaxed. Many of the old-school STR protocols don’t apply when you have access to a lot of information. Many SNPs can drop out, some can even be “noise,” the signal may not be clean—and yet you can still crack the case!
Engineers understand this concept well. It’s what we call graceful degradation—when, say, a few flipped bits on a digital video signal are hardly noticed. The same is true for a large SNP file.
And so, when Astrea retrieved the 2 million SNPs, the company didn’t rely on the traditional framework for DNA-sequencing reads. It used a completely different mathematical framework, called imputation. The concept of imputation is not yet fully appreciated by forensics experts who have a biological background. However, for an electronics engineer, the concept is similar to error correction: We infer and “impute” bits of information that have dropped out of a received digital signal. Such an approach is not possible with a few STRs, but when handling over a million SNPs, it’s a different ball game.
Much of the work on identifying Charles Webb from his genealogy had to be done manually because there are simply no automated tools for the task. As an electronics engineer, I now see possible ways to make tools that would speed up the process. One such tool my team has been working on, together with Colleen Fitzpatrick, is software that can input an entire family tree and represent all of the birth locations as colored dots on Google Earth. This helps to visualize geolocation when dealing with a large and complex family.
The Somerton Man case still has its mysteries. We cannot yet determine where Webb lived in his final weeks or what he was doing. Although the literary clue he left in his pocket was probably an elliptical suicide note, we cannot confirm the exact cause of death. There is still room for research; there is much we do not know.
This article appears in the April 2023 print issue as “Finding Somerton Man.”
Social work staff explain how continuing professional development increases their understanding and helps protect the people they work with
Being a social worker is not just about helping people, it is also a commitment to lifelong learning. Every day brings challenges and real-life lessons but those working in social care must also complete two pieces of continuing professional development (CPD) annually to maintain their registered status.
CPD does not have to take place in a classroom as social workers are able to learn through a range of experiences in their working – and personal – lives. Conventional training and supervision is an option, but the regulator, Social Work England, also allows CPD from case work, professional feedback, mentoring, and personal lived experience. It particularly encourages CPD that is very personal to the practitioner. As long as it is relevant to a person’s role, and they can reflect on the learning and demonstrate how it has had a positive influence on their work, CPD can take some unexpected forms.
Social media and podcasts. Dunmore Chihwehwete, a social care team manager in the London borough of Barnet, finds YouTube a valuable educational resource. He says: “I’ve learned a lot about the interaction between children and adults from watching recorded sessions between respected psychotherapists and their clients, particularly Salvador Minuchin. I listen to podcasts and audiobooks in the car. The truth is you’re always learning, whether it’s watching a Ted Talk or following an academic on Twitter. I also use an app called iTunes U, where universities upload lectures.”
Criticism and praise. Powerful lessons are learned when things go wrong. Anna Ramsey, a service manager for Essex county council’s adult social care department, takes part in a regular online meeting with her team in which good and bad news stories are shared. She says: “Some complaints are hard to hear, but they’re important learning opportunities. We need to ask: ‘How could we have done better?’ We celebrate successes and learn from errors.”
News, events and charitable efforts. A recently qualified social worker in Manchester, Ashiq Khan, gets involved in charities alongside his work and finds these organisations expand his understanding of the causes they champion. He also finds current events can have a big impact on his work. “I attended a vigil in Manchester for Brianna Ghey, the transgender girl killed there recently,” Khan says. “We have a responsibility in our work to challenge heteronormative ways of thinking and I’ve done a work presentation on the topic. It all made me think about our feelings about gender, sexual orientation, and general attitudes constructed over time. One of the most important reasons for undertaking CPD is to ensure the safety of the people we work with. It helps us to reflect and grow personally and as professionals.”
Documentaries, journals, films and novels. In a hectic working week, it can be tricky to find time for extra reading or watching work-related content. But Khan points out that interesting documentaries, as well as films and novels, can open up difficult topics and feed into CPD learning. “I recently watched a movie based on a true story about a woman who had been trafficked, who then ended up running brothels. It touched on areas we see in our work in Manchester and prompted me to do more research, leading me to other related documentaries. Eye-openers are everywhere, whether it’s in books, magazines or television,” says Khan.
Personal experience. Becky Cuming works for Cornwall council’s social services team, supporting five- to 11-year-olds who have experienced trauma. Some of her most valuable learning comes from reflecting on life experiences with colleagues. “In peer supervision, we used family therapist John Burnham’s social GGRRAAACCEEESSS exercise [looking at aspects of personal and social identity which afford people different levels of power and privilege] and we also did questionnaires on our own childhoods to increase our understanding of how the families we work with feel,” Cuming says.
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On a gin-clear December day, I’m sitting under the plexiglass bubble of a radically new kind of aircraft. It’s a little past noon at the Byron Airport in northern California; in the distance, a jagged line of wind turbines atop rolling hills marks the Altamont Pass, blades spinning lazily. Above me, a cloudless blue sky beckons.
The aircraft, called BlackFly, is unlike anything else on the planet. Built by a Palo Alto, Calif., startup called Opener, it’s an electric vertical take-off and landing (eVTOL) aircraft with stubby wings fore and aft of the pilot, each with four motors and propellers. Visually, it’s as though an aerial speedster from a 1930s pulp sci-fi story has sprung from the page.
There are a couple of hundred startups designing or flying eVTOLs. But only a dozen or so are making tiny, technologically sophisticated machines whose primary purpose is to provide exhilarating but safe flying experiences to people after relatively minimal training. And in that group, Opener has jumped out to an early lead, having built dozens of aircraft at its facilities in Palo Alto and trained more than a score of people to fly them.
My own route to the cockpit of a BlackFly was relatively straightforward. I contacted the company’s CEO, Ken Karklin, in September 2022, pitched him on the idea of a story and video, and three months later I was flying one of his aircraft.
Well, sort of flying it. My brief flight was so highly automated that I was more passenger than pilot. Nevertheless, I spent about a day and a half before the flight being trained to fly the machine manually, so that I could take control if anything went wrong. For this training, I wore a virtual-reality headset and sat in a chair that tilted and gyrated to simulate flying maneuvers. To “fly” this simulation I manipulated a joystick that was identical to the one in the cockpit of a BlackFly. Opener’s chief operating officer, Kristina L. Menton, and engineer Wyatt Warner took turns patiently explaining the operations of the vehicle and giving me challenging tasks to complete, such as hovering and performing virtual landings in a vicious crosswind.
The BlackFly is entirely controlled by that joystick, which is equipped with a trigger and also topped by a thumb switch. To take off, I squeeze the trigger while simultaneously pushing forward on the switch. The machine leaps into the air with the sound of a million bees, and with a surge of giddy elation I am climbing skyward.
Much more so than an airplane or helicopter, the BlackFly taps into archetypal human yearnings for flight, the kind represented by magic carpets, the flying cars in “The Jetsons,” and even those Mountain Banshees in the movie “Avatar.” I’ve had several unusual experiences in aircraft, including flying on NASA’s zero-gravity-simulating “Vomit Comet,” and being whisked around in a BlackFly was definitely the most absorbing and delightful. Gazing out over the Altamont Pass from an altitude of about 60 meters, I had a feeling of joyous release—from Earth’s gravity and from earthly troubles.
For technical details about the BlackFly and to learn more about its origin, go here.
The BlackFly is also a likely harbinger of things to come. Most of the startups developing eVTOLs are building vehicles meant to carry several passengers on commercial runs of less than 50 kilometers. Although the plan is for these to be flown by pilots initially, most of the companies anticipate a day when the flights will be completely automated. So specialized aircraft such as the BlackFly—designed to be registered and operated as “ultralight” aircraft under aviation regulations—could provide mountains of invaluable data on highly and fully automated flying and perhaps even help familiarize people with the idea of flying without a pilot. Indeed, during my flight, dozens of sensors gathered gigabytes of data, to add to the large reservoir Opener has already collected during many hundreds of test flights so far.
As of late February 2023, Opener hadn’t yet announced a retail price or an official commercial release date for the aircraft, which has been under development and testing for more than a decade. I’ll be keeping an eye out for further news of the company. Long after my flight was over I was still savoring the experience, and hoping for another one.
Special thanks to IEEE.tv for collaborating on production of this video.
Armageddon ruined everything. Armageddon—the 1998 movie, not the mythical battlefield—told the story of an asteroid headed straight for Earth, and a bunch of swaggering roughnecks sent in space shuttles to blow it up with a nuclear weapon.
“Armageddon is big and noisy and stupid and shameless, and it’s going to be huge at the box office,” wrote Jay Carr of the Boston Globe.
Carr was right—the film was the year’s second biggest hit (after Titanic)—and ever since, scientists have had to explain, patiently, that cluttering space with radioactive debris may not be the best way to protect ourselves. NASA is now trying a slightly less dramatic approach with a robotic mission called DART—short for Double Asteroid Redirection Test. On Monday at 7:14 p.m. EDT, if all goes well, the little spacecraft will crash into an asteroid called Dimorphos, about 11 million kilometers from Earth. Dimorphos is about 160 meters across, and orbits a 780-meter asteroid, 65803 Didymos. NASA TV plans to cover it live.
DART’s end will be violent, but not blockbuster-movie-violent. Music won’t swell and girlfriends back on Earth won’t swoon. Mission managers hope the spacecraft, with a mass of about 600 kilograms, hitting at 22,000 km/h, will nudge the asteroid slightly in its orbit, just enough to prove that it’s technologically possible in case a future asteroid has Earth in its crosshairs.
“Maybe once a century or so, there’ll be an asteroid sizeable enough that we’d like to certainly know, ahead of time, if it was going to impact,” says Lindley Johnson, who has the title of planetary defense officer at NASA.
“If you just take a hair off the orbital velocity, you’ve changed the orbit of the asteroid so that what would have been impact three or four years down the road is now a complete miss.”
So take that, Hollywood! If DART succeeds, it will show there are better fuels to protect Earth than testosterone.
The risk of a comet or asteroid that wipes out civilization is really very small, but large enough that policymakers take it seriously. NASA, ordered by the U.S. Congress in 2005 to scan the inner solar system for hazards, has found nearly 900 so-called NEOs—near-Earth objects—at least a kilometer across, more than 95 percent of all in that size range that probably exist. It has plotted their orbits far into the future, and none of them stand more than a fraction of a percent chance of hitting Earth in this millennium.
The DART spacecraft should crash into the asteroid Dimorphos and slow it in its orbit around the larger asteroid Didymos. The LICIACube cubesat will fly in formation to take images of the impact.Johns Hopkins APL/NASA
But there are smaller NEOs, perhaps 140 meters or more in diameter, too small to end civilization but large enough to cause mass destruction if they hit a populated area. There may be 25,000 that come within 50 million km of Earth’s orbit, and NASA estimates telescopes have only found about 40 percent of them. That’s why scientists want to expand the search for them and have good ways to deal with them if necessary. DART is the first test.
NASA takes pains to say this is a low-risk mission. Didymos and Dimorphos never cross Earth’s orbit, and computer simulations show that no matter where or how hard DART hits, it cannot possibly divert either one enough to put Earth in danger. Scientists want to see if DART can alter Dimorphos’s speed by perhaps a few centimeters per second.
The DART spacecraft, a 1-meter cube with two long solar panels, is elegantly simple, equipped with a telescope called DRACO, hydrazine maneuvering thrusters, a xenon-fueled ion engine and a navigation system called SMART Nav. It was launched by a SpaceX rocket in November. About 4 hours and 90,000 km before the hoped-for impact, SMART Nav will take over control of the spacecraft, using optical images from the telescope. Didymos, the larger object, should be a point of light by then; Dimorphos, the intended target, will probably not appear as more than one pixel until about 50 minutes before impact. DART will send one image per second back to Earth, but the spacecraft is autonomous; signals from the ground, 38 light-seconds away, would be useless for steering as the ship races in.
The DART spacecraft separated from its SpaceX Falcon 9 launch vehicle, 55 minutes after liftoff from Vandenberg Space Force Base, in California, 24 November 2021. In this image from the rocket, the spacecraft had not yet unfurled its solar panels.NASA
What’s more, nobody knows the shape or consistency of little Dimorphos. Is it a solid boulder or a loose cluster of rubble? Is it smooth or craggy, round or elongated? “We’re trying to hit the center,” says Evan Smith, the deputy mission systems engineer at the Johns Hopkins Applied Physics Laboratory, which is running DART. “We don’t want to overcorrect for some mountain or crater on one side that’s throwing an odd shadow or something.”
So on final approach, DART will cover 800 km without any steering. Thruster firings could blur the last images of Dimorphos’s surface, which scientists want to study. Impact should be imaged from about 50 km away by an Italian-made minisatellite, called LICIACube, which DART released two weeks ago.
“In the minutes following impact, I know everybody is going be high fiving on the engineering side,” said Tom Statler, DART’s program scientist at NASA, “but I’m going be imagining all the cool stuff that is actually going on on the asteroid, with a crater being dug and ejecta being blasted off.”
There is, of course, a possibility that DART will miss, in which case there should be enough fuel on board to allow engineers to go after a backup target. But an advantage of the Didymos-Dimorphos pair is that it should help in calculating how much effect the impact had. Telescopes on Earth (plus the Hubble and Webb space telescopes) may struggle to measure infinitesimal changes in the orbit of Dimorphos around the sun; it should be easier to see how much its orbit around Didymos is affected. The simplest measurement may be of the changing brightness of the double asteroid, as Dimorphos moves in front of or behind its partner, perhaps more quickly or slowly than it did before impact.
“We are moving an asteroid,” said Statler. “We are changing the motion of a natural celestial body in space. Humanity’s never done that before.”
Non-fungible tokens (NFTs) are the most popular digital assets today, capturing the attention of cryptocurrency investors, whales and people from around the world. People find it amazing that some users spend thousands or millions of dollars on a single NFT-based image of a monkey or other token, but you can simply take a screenshot for free. So here we share some freuently asked question about NFTs.
NFT stands for non-fungible token, which is a cryptographic token on a blockchain with unique identification codes that distinguish it from other tokens. NFTs are unique and not interchangeable, which means no two NFTs are the same. NFTs can be a unique artwork, GIF, Images, videos, Audio album. in-game items, collectibles etc.
A blockchain is a distributed digital ledger that allows for the secure storage of data. By recording any kind of information—such as bank account transactions, the ownership of Non-Fungible Tokens (NFTs), or Decentralized Finance (DeFi) smart contracts—in one place, and distributing it to many different computers, blockchains ensure that data can’t be manipulated without everyone in the system being aware.
The value of an NFT comes from its ability to be traded freely and securely on the blockchain, which is not possible with other current digital ownership solutionsThe NFT points to its location on the blockchain, but doesn’t necessarily contain the digital property. For example, if you replace one bitcoin with another, you will still have the same thing. If you buy a non-fungible item, such as a movie ticket, it is impossible to replace it with any other movie ticket because each ticket is unique to a specific time and place.
One of the unique characteristics of non-fungible tokens (NFTs) is that they can be tokenised to create a digital certificate of ownership that can be bought, sold and traded on the blockchain.
As with crypto-currency, records of who owns what are stored on a ledger that is maintained by thousands of computers around the world. These records can’t be forged because the whole system operates on an open-source network.
NFTs also contain smart contracts—small computer programs that run on the blockchain—that give the artist, for example, a cut of any future sale of the token.
Non-fungible tokens (NFTs) aren't cryptocurrencies, but they do use blockchain technology. Many NFTs are based on Ethereum, where the blockchain serves as a ledger for all the transactions related to said NFT and the properties it represents.5) How to make an NFT?
Anyone can create an NFT. All you need is a digital wallet, some ethereum tokens and a connection to an NFT marketplace where you’ll be able to upload and sell your creations
When you purchase a stock in NFT, that purchase is recorded on the blockchain—the bitcoin ledger of transactions—and that entry acts as your proof of ownership.
The value of an NFT varies a lot based on the digital asset up for grabs. People use NFTs to trade and sell digital art, so when creating an NFT, you should consider the popularity of your digital artwork along with historical statistics.
In the year 2021, a digital artist called Pak created an artwork called The Merge. It was sold on the Nifty Gateway NFT market for $91.8 million.
Non-fungible tokens can be used in investment opportunities. One can purchase an NFT and resell it at a profit. Certain NFT marketplaces let sellers of NFTs keep a percentage of the profits from sales of the assets they create.
Many people want to buy NFTs because it lets them support the arts and own something cool from their favorite musicians, brands, and celebrities. NFTs also give artists an opportunity to program in continual royalties if someone buys their work. Galleries see this as a way to reach new buyers interested in art.
There are many places to buy digital assets, like opensea and their policies vary. On top shot, for instance, you sign up for a waitlist that can be thousands of people long. When a digital asset goes on sale, you are occasionally chosen to purchase it.
To mint an NFT token, you must pay some amount of gas fee to process the transaction on the Etherum blockchain, but you can mint your NFT on a different blockchain called Polygon to avoid paying gas fees. This option is available on OpenSea and this simply denotes that your NFT will only be able to trade using Polygon's blockchain and not Etherum's blockchain. Mintable allows you to mint NFTs for free without paying any gas fees.
The answer is no. Non-Fungible Tokens are minted on the blockchain using cryptocurrencies such as Etherum, Solana, Polygon, and so on. Once a Non-Fungible Token is minted, the transaction is recorded on the blockchain and the contract or license is awarded to whoever has that Non-Fungible Token in their wallet.
You can sell your work and creations by attaching a license to it on the blockchain, where its ownership can be transferred. This lets you get exposure without losing full ownership of your work. Some of the most successful projects include Cryptopunks, Bored Ape Yatch Club NFTs, SandBox, World of Women and so on. These NFT projects have gained popularity globally and are owned by celebrities and other successful entrepreneurs. Owning one of these NFTs gives you an automatic ticket to exclusive business meetings and life-changing connections.
That’s a wrap. Hope you guys found this article enlightening. I just answer some question with my limited knowledge about NFTs. If you have any questions or suggestions, feel free to drop them in the comment section below. Also I have a question for you, Is bitcoin an NFTs? let me know in The comment section below
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