Tag Archives: Problem

NASA’s Lucy spacecraft experiences problem with solar array shortly after launch

A researcher working on Lucy’s solar panels pre-launch.


NASA

NASA had reason to celebrate Saturday after launching Lucy, a spacecraft tasked with investigating the Trojan asteroids locked in Jupiter’s orbit. But Lucy appears to have encountered its first obstacle: One of the probe’s two solar arrays, which are powering Lucy’s exploration, may not properly be locked in place.

“Lucy’s two solar arrays have deployed, and both are producing power and the battery is charging,” NASA said Sunday in a blog post. “While one of the arrays has latched, indications are that the second array may not be fully latched.”

“In the current spacecraft attitude, Lucy can continue to operate with no threat to its health and safety. The team is analyzing spacecraft data to understand the situation and determine next steps to achieve full deployment of the solar array.”

Thomas Zurbuchen, NASA’s associate director for science, tweeted Sunday that he’s confident the array issue will be solved. 

“NASA’s Lucy mission is safe and stable,” he said. “The two solar arrays have deployed, but one may not be fully latched. The team is analyzing data to determine next steps. This team has overcome many challenges already and I am confident they will prevail here as well.”

The two solar arrays were folded when Lucy launched and were designed to unfurl like Chinese fans once the spacecraft reached space. The arrays were expected to take 20 minutes to fully unfurl, which the mission’s principal investigator said would “determine if the rest of the 12-year mission will be a success.” The solar panels were successfully deployed 91 minutes after launch. Now it’s just a matter of getting the second one to latch properly.

CNET reached out to the Lucy team for confirmation on how the unlatched arrays might affect performance and how the issue may be rectified but didn’t immediately hear back.

Lucy’s ultimate goal is to explore a set of asteroids that travel in Jupiter’s orbit and have never been studied up close before. These Trojan asteroids move as huge swarms, or camps, at the Lagrangian points in Jupiter’s orbit. Lagrangian points are regions where the push and pull of gravity from both Jupiter and the sun lock the camps in place, leading and trailing Jupiter in its journey around the sun in perpetuity.  

The collection of amorphous space rocks is like a series of cosmic fossils, providing a window into the earliest era of our solar system, some 4.6 billion years ago. Lucy will act as a cosmic paleontologist, flying past eight “fossils” at a distance and studying their surfaces with infrared imagers and cameras.   



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Boeing and NASA continue to investigate Starliner valve problem

LONG BEACH, Calif. — NASA and Boeing are targeting the first half of 2022 to launch the rescheduled test flight of the CST-100 Starliner commercial crew vehicle as engineers continue to investigate a valve problem that postponed the mission two months ago.

In an Oct. 8 statement, NASA said engineers had managed to free all but one of 13 stuck propellant valves in the Starliner spacecraft. Those stuck valves forced the postponement of Boeing’s uncrewed Orbital Flight Test (OFT) 2 mission in early August. The one remaining valve still stuck closed is kept in that state deliberately “to preserve forensics for direct root cause analysis.”

The analysis has yet to determine the root cause for the stuck valves, but NASA stated Boeing believed the most probable cause was interaction between moisture and nitrogen tetroxide propellant, a cause Boeing officials offered in August. The source of the moisture was not included in the statement, which added that “although some verification work remains underway, our confidence is high enough that we are commencing corrective and preventive actions.”

As part of those efforts, Boeing technicians partially disassembled three valves last month and will remove three others in the coming weeks for inspection. Those efforts will determine how Boeing will prepare the spacecraft for a new launch attempt, with options ranging from “minor refurbishment” of components in the Starliner’s service module to replacing the service module entirely.

NASA confirmed in the statement that the next OFT-2 launch attempt will not be this year. “The team currently is working toward opportunities in the first half of 2022 pending hardware readiness, the rocket manifest, and space station availability,” the agency said.

It had already been clear that OFT-2 was unlikely to fly this year because of both the ongoing investigation and other missions to the station. “The timeline and the manifest through the end of the year is pretty tight right now,” said Kathy Lueders, NASA associate administrator for space operations, at a Sept. 21 briefing. “My gut is that it would probably be more likely to be next year, but we’re still working through that timeline.”

Steve Stich, NASA commercial crew program manager, offered the same assessment during an Oct. 6 briefing about the upcoming SpaceX Crew-3 commercial crew mission. “There’s really not an opportunity for OFT-2 to fly this year,” he said. “From a station perspective, it would be some time early next year where a window would open up for OFT-2.”

Starliner would dock at one of two ports, one of which will be occupied by a Crew Dragon spacecraft. The other port will be occupied by a cargo Dragon spacecraft starting in early December, likely until early January. A commercial Crew Dragon spacecraft, flying the Ax-1 mission for Axiom Space, is scheduled to launch Feb. 21 and spend a week docked to the station using that other port.

Stich said at the Oct. 6 briefing it was too soon to narrow down a launch date for OFT-2, given the uncertainties about vehicle readiness. “We really need to get to a root cause on the valve issue on the service module,” he said. “Once we do that, we’ll have a little more certainty on the path forward of when OFT-2 is, and then from that, where CFT is.” CFT, or Crew Flight Test, will be a crewed test flight with up to three NASA astronauts on board that follows OFT-2.

The delays mean that more than two years will elapse between the original OFT mission in December 2019, which suffered several software and communications problems that truncated the flight, and OFT-2. SpaceX, meanwhile, has conducted since OFT the Demo-2 crewed test flight and the Crew-1 and Crew-2 operational missions. The next NASA Crew Dragon mission, Crew-3, is scheduled for launch Oct. 30, with Crew-4 and Crew-5 planned for 2022.

At the briefing, NASA defended Boeing despite those extended delays. “We have not lost confidence in the Boeing team. The team is doing an incredible job of working through the root cause on the valve issue,” Stich said. “I have every bit of confidence that they’re going to figure out what the problem is and they’ll rectify it and we’ll get back to flight really soon.”

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Many Indians can’t prove their loved ones died from Covid. And that could be a problem

But hospitals in the Indian city of Varanasi had run out of space, oxygen, medicine, tests — everything.

“They told us everywhere was bad and people were lying on the hospital floors, and that there were no beds at all,” the 33-year-old said.

In theory, the program should help people like Srivastava. But experts believe the true death toll may be many times the official tally of 450,000 — and the families of some victims may end up missing out on compensation because they either don’t have a death certificate or the cause of death is not listed as Covid-19.

The Indian government has promised no families will be denied compensation “solely on the ground” that their death certificate does not mention Covid-19.

But days after the compensation plan was announced, the rules remain unclear — and that’s causing stress for many Indians struggling to feed their families after losing a breadwinner during one of the world’s worst Covid outbreaks.

The uncounted dead

On the face of it, the criteria for compensation is relatively straightforward.

Families can receive the payout if their loved one died within 30 days of a Covid-19 diagnosis, regardless of whether the death took place in hospital or at home, according to the guidelines approved by the Supreme Court Monday. They are also eligible if the family member died while in hospital being treated for Covid-19 — even if the death happened more than 30 days after diagnosis.

To be considered a Covid case, the deceased must have been diagnosed with a positive Covid test or have been “clinically determined” by a physician. And to apply for compensation, next of kin must provide a death certificate stating Covid-19 was the cause of death.

But for many in India, these guidelines pose a massive problem.

Even before the pandemic, India was undercounting its dead.
The country’s underfunded public health infrastructure means that in normal times, only 86% of deaths nationwide were registered in government systems. And only 22% of all registered fatalities were given an official cause of death, certified by a doctor, according to community medicine specialist Dr. Hemant Shewade.

That problem has intensified during Covid, with studies suggesting millions of people like Srivastava’s mother aren’t included in the death toll.

In July, the US-based Center for Global Development estimated that during the pandemic, India could have had between 3.4 and 4.9 million more deaths than in previous years — meaning the government’s official Covid-19 toll could be several times lower than reality.

The figures suggest the Indian government underreported the number of pandemic deaths, a claim the government has denied.

Even if victims have a death certificate, many don’t explicitly list Covid-19 as a cause as they weren’t officially diagnosed, said Jyot Jeet, chairperson of the Delhi-based organization SBS Foundation, which conducted free cremations during the second wave.

Instead, many Covid victims’ death certificates “either say they died of lung failure, respiratory disease, cardiac arrest,” he added.

The guidelines say families can apply to amend the cause of death on a death certificate, and assert that no families will be denied compensation “solely on the ground” their death certificate does not mention Covid-19.

A district-level committee will review their application and examine the deceased member’s medical records — and if they agree Covid was the cause of death, they will issue a fresh death certificate saying so, according to the guidelines.

However, no further details have been provided on what criteria the committee will use to gauge the cause of a months-old death, and what evidence families will need to provide.

“That is absolutely complicated,” said Pranay Kotasthane, deputy director of the India-based Takshashila Institution think tank, adding that if the government is resolved to help people rather than policing the money, the plan could benefit families.

CNN has reached out to India’s Ministry of Health for comment.

Red tape

After Pooja Sharma’s husband died of Covid-19 in April, she felt helpless and alone, with no idea how to provide for their two young daughters.

Her husband, a shopkeeper, was the breadwinner of the family. But as his condition deteriorated, he told her to take care of their children.

“I didn’t know how I would do that,” said the 33-year-old mother, who lives in India’s capital region Delhi. “I haven’t been to school and didn’t know what I could do to make money.”

Sharma says her husband’s death certificate lists Covid as the cause — but she may still face an uphill battle. The program promises families will have their compensation within 30 days of proving their eligibility, although previous government initiatives — both before and during the pandemic — have been beset by long delays and frustrating bureaucracy.

“Underprivileged or poor communities are the worst hit — first by Covid and second by the system,” said Jeet, the SBS Foundation chairperson. Because of their low literacy levels, he added it is “a tedious task” for families to navigate the complications in the system, which includes collecting the appropriate paperwork, filling out forms, communicating with local district officials and providing medical information.

The country’s most recent Census in 2011 found that 73% of Indians are literate, and the number is even lower for women in rural areas where just over 50% can read and write.

Kotasthane, the think tank director, also worries about the ability of people to access payments. “The cost of getting the compensation should not be more than the compensation itself,” he said.

Sharma has already run up against government red tape for a state-run support program she applied for in June.

“I filled out all the paperwork with the help of others. I went to government offices every day,” she said. “I haven’t heard anything from them. I don’t think that money will ever come through.”

Though she will apply for the new compensation program, she said she’s not confident of receiving any payments — and either way, it’s not enough to compensate for her loss.

“I don’t know if I will even get that sum of money,” Sharma added. “50,000 rupees will not give me my husband back. My life will not be the same.”

Too little, too late

Many share Sharma’s sense of disillusionment, and the sentiment that the compensation offered is too little, too late.

The second wave effectively traumatized an entire nation, laying bare the government’s missteps and sowing deep anger among a public that largely felt abandoned by its leaders.

Many factors played into the severity of the second wave. The government was slow to act and had not prepared in advance, leading to crippling medical supply shortages at the most desperate moment. The medical system collapsed — at the peak of the wave, more than 4,000 people were dying every day, many on the streets and outside hospitals filled past capacity.

The shortages also led to a boom in the black market, which price gouged oxygen cylinders and medicine. With no help in sight from the government, many families had no choice but to empty their savings and borrow money to buy overpriced goods, in the hope of saving loved ones.

Simran Kaur, founder of Pins and Needles, a non-profit organization supporting Covid widows in Delhi, said some women are facing debts while caring for several young children alone and without a breadwinner.

“They are already in so much debt because overnight, they went from earning a monthly salary through their husbands to earning nothing,” she said.

“A one-off payment from the government will not solve everything. It won’t educate her children, pay their rent, or put food on their table. It might sound good on paper, but it’s not enough.”

The compensation might be able to help India’s poorest families . But for most families, especially ones that have lost multiple members to Covid, “50,000 rupees is going to do nothing,” said Srivastava, who lost his mother.

Since the second wave, he and his sister — who were both ill with Covid while trying to save their mother — have recovered from infection. Deeper scars remain, as well as anger toward a government that “had barely done anything to prepare for Covid,” he said — but “there’s no option but to recover from the tragedy.”

“In India, people accept the fate, they say that it was God who did it, console themselves and move on,” he added. “We have the habit of enduring the tragedies. But it’s the government that has to make an effort.”

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Apple will finally let you report App Store scams with Report a Problem button

One month ago, we laid out a list of eight obvious things Apple could do to prove it puts App Store users ahead of profits. Today I learned the company acted on at least one of these ideas: Apple will now let you directly report a scammy app from its listing in the App Store with a new-and-improved version of its “Report a Problem” button.

As Richard Mazkewich and scam hunter Kosta Eleftheriou point out on Twitter, the button has not only returned to individual app listings for the first time in years, it now includes a dedicated “Report a scam or fraud” option in the drop-down menu.

Until iOS 15, the only way you could find this button was to scroll all the way down to the bottom of the Apps or Games tab in the App Store, get kicked out to a website where you’d need to re-sign in. Then you could pick from “Report suspicious activity,” “Report a quality issue”, “Request a refund” or “Find my content.” None of the options offered a clear way to report a scam, and the “Report suspicious activity” would redirect you to Apple Support instead.

To add insult to injury, Apple would only let you report “a quality issue” if you’d already paid money (and thus fallen for the scam).

But now, it seems like every free app with in-app-purchases appears to offer the “Report a Problem” option. I checked a handful of apps I’ve never paid for (but could have) and they all displayed the button. You’ll still get kicked out to a website where you’ll need to sign in, but overall this seems like a step forward.

Of course, the big question is whether Apple will actually take action on those reports. Another thing we pointed out last month is that Apple only has 500 human app reviewers — compared to 15,000 content moderators at Facebook, 20,000 at Google, and, yes, 2,200 at Twitter (a company far from the most valuable and profitable in the world).

Intriguingly, there may be some movement on that front too: Eleftheriou pointed out to me that Apple began hiring for an “ASI Investigator” position on September 8th. “ASI Investigators are accountable for investigating fraudulent apps and trends, as well as the developers involved,” part of the job posting read.

Shame that job posting no longer exists; it’s been taken down.

Perhaps, at the very least, Apple’s automated systems can use the new data to sound the alarm when a scam app crosses a predefined threshold.

Apple definitely seems to be listening to the recent wave of anger around the App Store. In addition to a variety of small forced concessions in the wake of judicial and regulatory scrutiny, Apple just started allowing users to review the company’s own apps that it bundles with every iPhone. Apple Podcasts, Weather, and even the built in Calculator app are all fair game for angry 1-star reviews. Immunity from user scrutiny may not be the most egregious advantage Apple has enjoyed in its own App Store, but it’s nice to see the company leveling the playing field even a little bit.

Here are the other suggestions we had for Apple’s App Store, and a brief history of significant policy changes that Apple’s made over the years. Yes, we’re keeping track.



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‘The Problem With Jon Stewart’ review: Stewart gets serious and goes deep into advocacy journalism for Apple TV+

Stewart — who has already adopted this role with his crusade on behalf of 9/11 first responders — has capitalized on the freedom that his reputation affords him in order to take this leap, doing something that’s the equivalent of serving steamed vegetables to those fans who might have tuned in expecting salty snacks. He somewhat sheepishly acknowledges as much during segments in which he strategizes with his producers, some of whom hail from news backgrounds that speak to the program’s hybrid nature.

Still, Stewart has always practiced a form of journalism, using comedy as the delivery system. At “The Daily Show,” that meant reaching viewers who might not otherwise be heavy news consumers, dressing up current events in a more enticing package.

By moving to the less commercially pressured realm of streaming, Stewart has dispensed with the pretense of spooning out sugar to help the messages go down. The not-unreasonable takeaway from that is having spent time surveying the state of the US and the world, the comic — who can’t help but joke at times in asides and while talking to guests and newsmakers — has determined the stakes are too dire to spend much time clowning around.

Scheduled on an every-other-week basis with a related podcast, Stewart opens with a topic near and dear to his heart, focusing on veterans whose health claims associated with “burn pits” have fallen on deaf ears with the US government.

“We support our troops, unless they actually need support,” Stewart says, proceeding to interview suffering military personnel along with their family members, followed by a very pointed sit-down with current US Secretary of Veterans Affairs Denis McDonough.

A second episode actually achieves a better balance of what “The Problem” hopes to become, examining the most disingenuous cries of “Freedom!” in response to vaccine and mask mandates, before shifting to the drift toward authoritarianism in the US. Stewart interviews those who have witnessed the process firsthand in Venezuela, the Philippines and the Middle East, including journalist Maria Ressa and Bassem Youssef, who was once dubbed the “Egyptian Jon Stewart.”
Stewart has always exhibited first-rate interviewing chops, and with episodes running about 45 minutes, he has ample time to display them. This show follows a never-realized plan for a series at HBO, whose former chief Richard Plepler helped bring the project to Apple, which clearly gave the comic all the creative latitude he could have wanted. (CNN and HBO are both part of WarnerMedia.)

The most obvious problem with “The Problem” is its emphasis on righting and exposing wrongs comes at the expense of being entertaining, at least in the way people have come to expect. The overall effect brings to mind the historic resistance when a comedic actor segues into dramatic roles, and the pushback from parts of the audience figures to be similar.

Stewart has anticipated that potential criticism and seems content to plead guilty to it. Having spent years eliciting laughs, in “The Problem” Stewart has different priorities, embarking, however lofty it might sound, on a search for solutions.

“The Problem With Jon Stewart” premieres Sept. 30 on Apple TV+.

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Apple says the iPad mini’s ‘jelly scrolling’ problem is normal

Shortly after the new iPad mini was released, people started complaining about seeing a weird “jelly-like” effect on their screens while scrolling. It appears as if one side of the screen scrolls at a different rate than the other, making it look like the screen is wobbling. Those who were hoping for a fix to the problem would probably be disappointed by Apple’s response, because the tech giant has told Ars Technica that the device’s screen wobbling problem isn’t a problem at all.

A spokesperson told the publication that the jelly-like effect people are seeing is typical for LCD screens, because they refresh line by line. As such, it’s normal for the lines at the top of the display to refresh at a different rate than the lines at the bottom. Ars Technica insists, though, that the effect is much noticeable on the iPad mini than it is on other 60Hz LCD iPads, including the latest entry-level model that was released with the mini. Further, there’s a visible line dividing the screen in the middle when the tablet is in portrait mode.

It remains to be seen whether Apple would do something about this jelly scrolling effect in the future, considering people are airing complaints about it. For now, it looks the tech giant’s stance is that it’s par for the course for an LCD screen and that users will just have to get used to it.

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SpaceX had a problem onboard the first all-tourist flight. It could have been much worse

The SpaceX Crew Dragon spacecraft’s systems were warning the crew of a “significant” issue, Isaacman said. They’d spent months poring over SpaceX manuals and training to respond to in-space emergencies, so they leaped into action, working with SpaceX ground controllers to pinpoint the cause of the error.

As it turned out, the Crew Dragon wasn’t in jeopardy. But the on board toilet was.

Nothing in space is easy, including going to the bathroom. In a healthy human on Earth, making sure everything ends up in the toilet is usually a matter of simple aim. But in space, there is no feeling of gravity. There’s no guarantee that what comes out will go…where it’s supposed to. Waste can — and does — go in every possible direction.

To solve that problem, space toilets have fans inside them, which are used to create suction. Essentially they pull waste out of the human body and keep it stored away.

And the Crew Dragon’s “waste management system” fans were experiencing mechanical problems. That is what tripped the alarm the crew heard.

Scott “Kidd” Poteet, an Inspiration4 mission director who helped oversee the mission from the ground, tipped reporters off about the issue in an interview with CBS. Poteet and SpaceX’s director of crew mission management later confirmed there were “issues” with the waste management system at a press conference but didn’t go into detail, setting off an immediate wave of speculation that the error could’ve created a disastrous mess.

When asked directly about that on Thursday, however, Isaacman said “I want to be 100% clear: There were no issues in the cabin at all as it relates to that.”

But Isaacman and his fellow travelers on the Inspiration4 mission did have to work with SpaceX to respond to the problem during their three-day stay in orbit, during which they experienced numerous communications blackouts, highlighting the importance of the crew’s thorough training regimen.

“I would say probably somewhere around 10% of our time on orbit we had no [communication with the ground], and we were a very calm, cool crew during that,” he said, adding that “mental toughness and a good frame of mind and a good attitude” were crucial to the mission.

“The psychological aspect is one area where you can’t compromise because…there were obviously circumstances that happened up there where if you had somebody that didn’t have that mental toughness and started to react poorly, that really could’ve brought down the whole mission,” Isaacman said.

SpaceX did not respond to CNN Business’ requests for comment.

The toilet anecdote also highlights a fundamental truth about humanity and its extraterrestrial ambitions — no matter how polished and glitzy we may imagine our space-faring future, biological realities remain.

Excreta in space, a history

Isaacman was — as numerous astronauts before him — bashful when it came to discussing the “toilet situation.”

“Nobody really wants to get into the gory details,” Isaacman said. But when the Inspiration4 crew talked to some NASA astronauts, they said “using the bathroom and space is hard, and you’ve got to be very — what was the word? — very kind to one another.”

He added that, despite the on-board toilet issues, nobody suffered any accidents or indignities.

“I don’t know who was training them, but we were able to work through it and get [the toilet] going even with what was initially challenging circumstances, so there was nothing ever like, you know, in the cabin or anything like that,” he said.

Figuring out how to safely relieve oneself in space was, however, was a fundamental question posed at the dawn of human spaceflight half a century ago, and the path to answers was not error-free.

During the 1969 Apollo 10 mission — the one that saw Thomas Stafford, John Young and Eugene Cernan circumnavigate the moon — Stafford reported back to mission control on Day Six of the mission that a piece of waste was floating through the cabin, according to once-confidential government documents.
“Give me a napkin, quick,” Stafford is recorded as saying a few minutes before Cernan spots another one: “Here’s another goddamn turd.”
The feces collection process at the time, a NASA report later revealed, was an “extremely basic” plastic bag that was “taped to the buttocks.”
“The fecal bag system was marginally functional and was described as very ‘distasteful’ by the crew,” an official NASA report from 2007 later revealed. “The bags provided no odor control in the small capsule and the odor was prominent.”
In-space toilets have evolved since then, thanks to strenuous efforts from NASA scientists, as journalist Mary Roach, author of “Packing for Mars,” told NPR in 2010.

“The problem here is you’ve got this very elaborate space toilet, and you need to test it. Well, you’ve got to, you know, haul it over to Ellington Field, board it onto a zero-gravity simulator — a plane that does these elaborate up-and-down arcs — and then you’ve got to find some poor volunteer from the Waste System Management Office to test it. And I don’t know about you, but, I mean, to do it on demand in 20 seconds, now that is asking a lot of your colon. So it’s very elaborate and tricky.”

And, Roach writes in “Packing for Mars,” astronaut potty training is no laughing matter.

“The simple act of urination can, without gravity, become a medical emergency requiring catheterization and embarrassing radio consults with flight surgeons,” she wrote. And because urine behaves differently inside the bladder in space, it can be very difficult to tell when one needs to go.

Adapting to space

The human body is evolutionarily designed for life on Earth, with its gravity, oxygen-rich air and predictable ecological cycles. It is specifically not designed to float disoriented in weightlessness, a fact that has caused numerous astronauts to experience a sickening queasiness, especially during the first couple of days in orbit.

“I vomited 93 minutes into my first flight,” NASA astronaut Steven Smith, a veteran of four Space Shuttle missions, told one journalist. “That was the first of 100 times over the four flights. It’s odd going to a job where you know you’re going to throw up.”

NASA has a formal term for the illness — Space Adaptation Syndrome, which in one paper it estimates about 80% of astronauts have experienced.

Isaacman said that during the Inspiration4 mission, he didn’t feel the urge to vomit. But adjusting to microgravity can be uncomfortable.

“It’s just this pooling in your head, like when you hang upside down on your bed,” he told CNN Business. “But you have to kind of find a way to just ignore it and work through it…About a day later, it kind of balances out and you don’t know it as much.”

Not all of his crewmates were as lucky. Hayley Arceneaux, a 29-year-old cancer survivor who served as Inspiration4’s medical officer, had to administer Phenergan shots — an antihistamine used to treat motion sickness to combat nausea, Isaacman said.

The inescapable fact is that humans will be battling maladies for as long as we continue to look at space and see it as place we should be going. That’s why many journalists, including Roach, have questioned our tendency to romanticize space travel and downplay the harsh realities and risks.

But despite the discomfort, Isaacman said he has zero regrets about his decision to spend roughly $200 million on a three-day spaceflight.

“I hope that this is a model for future missions,” he said, adding that he believes in SpaceX’s mission to eventually support entire colonies of people living in outer space.

During his flight, “I just felt really charged up and energized about the idea that we just have to keep pushing and going further and further.”

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If endangered primates disappear, so will their parasites. That’s actually a problem

New research predicts that the loss of 108 threatened primates could doom an additional 176 parasite species to extinction, because they have no other suitable hosts. Credit: Marie-Claire Chelini and TriCEM

We put “save the chimps” on t-shirts and posters. But you’ll never see anyone walking around in a shirt that says “save the chimpanzee lice.” People seem to be more aware of the plight of endangered gorillas than of the gorillas’ gut worms, or are understandably more enamored with mouse lemurs than their mites.

Our closest animal relatives face a precarious future: Half of the world’s roughly 500 primate species are at risk of extinction due to human activities such as hunting, trapping and deforestation. But the demise of the world’s threatened primates could trigger even more species extinctions for the parasites that lurk on and in them, according to a Duke University-led study.

“If all the primates that are threatened with extinction really do die out, they won’t be the only species that go extinct,” said first author James Herrera of the Duke Lemur Center. “It could also be twice that many parasites.”

“That’s a whole realm of biodiversity that could be going extinct without us even noticing,” Herrera said. “There’s so little that we know about what they do in the body, that we don’t even know what we’re losing.”

One previous study suggests that some 85% to 95% of the parasitic worms of animals aren’t even known to science yet, much less evaluated by the authoritative extinction ‘Red List’ kept by the International Union for Conservation of Nature (IUCN).

Herrera admits this may seem like an odd thing to get worked up about, given all our efforts to deworm and delouse ourselves and our pets. To most people, parasites are “something we want to eradicate, rather than conserve,” Herrera said.

The thought of alien creatures biting, wriggling, squirming, and nestling into the warm wet folds of the intestines makes most people shudder. But parasites don’t always cause noticeable symptoms or make their hosts sick, Herrera said. Parasites can even have some surprising benefits, such as when worms in the gut help the body ward off other infections, or keep autoimmune disorders in check.

To gauge the potential loss of biodiversity if primates go extinct, Herrera and Duke professors Charlie Nunn and James Moody used network analysis techniques to measure the potential ripple effects on the parasites that set up camp in or on primate bodies. Their work appeared Sept. 20 in the journal Philosophical Transactions B.

In their model, species are connected in complex webs of interactions involving 213 primates—monkeys, apes, lemurs and galagos—and 763 worms, mites, protists, and other parasites known to infect them. When one primate host disappears, the parasites connected to it can no longer depend on it for survival. Sever enough of these connections, and their loss sets off a deadly cascade where one extinction begets another.

It’s a bit like the classic kids’ game, KerPlunk, Herrera said. You have a clear tube filled with marbles, which are resting on top of a web of crisscrossing sticks. Removing one or two sticks—or in this case, primate hosts—from the network does little harm, because the marbles are still supported by the remaining sticks. But as the game goes on and fewer sticks remain, it gets harder to keep the marbles from crashing down.

Currently, 108 of the 213 primate species in their dataset are considered threatened by the IUCN. The team found that if all those species were to go kaput, an additional 250 parasites could be doomed as well, and that 176 of these parasite species have no other suitable hosts.

The extinction cascade will likely be worse in isolated places like the island of Madagascar, the study revealed. There, shrinking forests, illegal hunting and collection for the pet trade are pushing 95% of lemur species ever closer to the brink, and more than 60% of lemur parasites inhabit a single host.

For instance, at least two species of nematode worms depend on the aye-aye, a long-fingered, bushy-tailed lemur with beaver-like teeth. If the aye-aye dies out, so too will the worms it carries.

The researchers say they aren’t able to predict, from their analyses, how many of the parasites in their dataset could potentially avert extinction by jumping ship and adapting to new hosts that are more abundant. But some of the most notorious diseases in humans, such as malaria, AIDS caused by HIV and yellow fever, got their start in other primates before spilling over to people, for instance when we share a watering hole, or when we butcher them for meat.

“It’s not that hard to imagine,” Herrera said.

The study is part of a special issue of Philosophical Transactions of the Royal Society B devoted to infectious disease macroecology.


95% of lemur population facing extinction: conservationists


More information:
James P. Herrera et al, Predictions of primate–parasite coextinction, Philosophical Transactions of the Royal Society B: Biological Sciences (2021). DOI: 10.1098/rstb.2020.0355
Provided by
Duke University

Citation:
If endangered primates disappear, so will their parasites. That’s actually a problem (2021, September 23)
retrieved 24 September 2021
from https://phys.org/news/2021-09-endangered-primates-parasites-problem.html

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Floods Have Swamped the US. The Next Health Problem: Mold

There’s a long history of natural disasters making people sick. Reports range from cases of Valley fever after the Northridge earthquake in California in 1994 tossed dirt containing spores of Coccidia bacteria into the air, to aspergillus infections caused by victims of the 2011 Japanese tsunami aspirating bacteria-laden water, to people infected and killed by fungi carried on debris from the Joplin, Missouri, tornado, also in 2011.

But it can be hard to pinpoint when an infection or reaction is related to mold specifically, because the damage caused by disasters exposes victims to so many substances. “After these flooding events or hurricanes, there’s so much going on: Not only are you dealing with a house full of mold, but you’re ripping that house apart, so there’s drywall and dust and plaster and all kinds of things that you’re potentially inhaling,” says Tom Chiller, a physician and chief of the mycotic diseases branch of the Centers for Disease Control and Prevention. “It’s hard to tease out the effect of mold.”

Researchers thus face a conundrum: Their clinical instincts tell them people are at risk, but they have a dearth of data to prove it. Immune-compromised people are always at risk for mold and fungal infections; their diminished defenses render them unable to clear away the fungal spores that we all breathe in every day, leaving them vulnerable to organisms such as aspergillus and the ferocious mutant yeast Candida auris. The CDC estimates that more than 75,000 people are hospitalized annually for invasive fungal infections, and cost the health care system about $4.5 billion a year.

The ones most at risk are transplant patients who received donor organs or underwent leukemia treatment, and take immune system-suppressing drugs to sustain their recovery. Those people, researchers say, shouldn’t be anywhere near a moldy house, let alone working to remediate one, and should stay away from floodwaters. But in a survey of 103 immunosuppressed patients the CDC and several Houston hospitals conducted after Hurricane Harvey, half of them admitted they had gone back to clean out their flooded houses, and only two-fifths of that half said they had worn a protective respirator.

The CDC has been working with some of those hospitals on a more complex post-Harvey project, not yet published, which reviews medical records from one year before and after the hurricane to capture whether immune-suppressed people developed invasive fungal infections related to the storm. There’s no clear signal in the data, says Mitsuru Toda, an epidemiologist in the agency’s mycotic diseases branch: “In aggregate, we do see an increase after Hurricane Harvey in the number of people who had invasive mold infections, but some hospitals had a decrease, some hospitals had an increase, and the numbers are small.”

Complicating that finding, she adds, is that some mold and fungal infections have incubation periods long enough that symptoms might not have manifested during that post-storm year. Plus, Toda says, some physicians in Houston told the agency they preemptively put their most immune-suppressed patients on antifungal drugs—which protected those patients, but would have confounded any calculations of the hurricane’s effect on their health.

Ostrosky-Zeichner was one of those clinicians. “In theory, we should be seeing hordes of mold infections after major flooding events and hurricanes, but we’re not quite seeing that so far,” he says.

Researchers are also worried about the much larger proportion of the population, estimated to be up to 40 percent, who are prone to allergies and could react to mold and fungal growths in their houses—as well as about the rest of the population, who can develop new allergies after exposure. “For most people, the health effect that we see most often is respiratory,” says Felicia Rabito, an epidemiologist and associate professor at Tulane’s School of Public Health and Tropical Medicine. “A severe reaction would be like a breathing problem; a less severe reaction would be allergic-type symptoms. If you’re an asthmatic, though, and mold is a trigger, you can trigger an asthma attack, which is a very serious reaction.”

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Scientists develop a statistical fix for archaeology’s dating problem

Stucco frieze from Placeres, Campeche. Early Classic period (c. 250 – 600 AD). Joyce Kelly (2001), An Archaeological Guide to Central and Southern Mexico, p.105. Credit: Wolfgang Sauber/Wikimedia Commons

Archeologists have long had a dating problem. The radiocarbon analysis typically used to reconstruct past human demographic changes relies on a method easily skewed by radiocarbon calibration curves and measurement uncertainty. And there’s never been a statistical fix that works—until now.

“Nobody has systematically explored the problem, or shown how you can statistically deal with it,” says Santa Fe Insitute archeologist Michael Price, lead author on a paper in the Journal of Archeological Science about a new method he developed for summarizing sets of radiocarbon dates. “It’s really exciting how this work came together. We identified a fundamental problem and fixed it.”

In recent decades, archeologists have increasingly relied on sets of radiocarbon dates to reconstruct past population size through an approach called “dates as data.” The core assumption is that the number of radiocarbon samples from a given period is proportional to the region’s population size at that time. Archeologists have traditionally used “summed probability densities,” or SPDs, to summarize these sets of radiocarbon dates. “But there are a lot of inherent issues with SPDs,” says Julie Hoggarth, Baylor University archeologist and a co-author on the paper.

Radiocarbon dating measures the decay of carbon-14 in organic matter. But the amount of carbon-14 in the atmosphere fluctuates through time; it’s not a constant baseline. So researchers create radiocarbon calibration curves that map the carbon-14 values to dates. Yet a single carbon-14 value can correspond to different dates—a problem known as “equifinality,” which can naturally bias the SPD curves. “That’s been a major issue,” and a hurdle for demographic analyses, says Hoggarth. “How do you know that the change you’re looking at is an actual change in population size, and it isn’t a change in the shape of the calibration curve?”

When she discussed the problem with Price several years ago, he told her he wasn’t a fan of SPDs, either. She asked what archeologists should do instead. Essentially, he said, “Well, there is no alternative.”

That realization led to a years-long quest. Price has developed an approach to estimating prehistoric populations that uses Bayesian reasoning and a flexible probability model that allows researchers to overcome the problem of equifinality. The approach also allows them to combine additional archeological information with radiocarbon analyses to get a more accurate population estimate. He and his team applied the approach to existing radiocarbon dates from the Maya city of Tikal, which has extensive prior archeological research. “It serves as a really good test case,” says Hoggarth, a Maya scholar. For a long time, archeologists debated two demographic reconstructions: Tikal’s population spiked in the early Classic period and then plateaued, or it spiked in the late Classic period. When the team applied the new Bayesian algorithm, “it showed a really steep population increase associated with the late Classic,” she says, “so that was really wonderful confirmation for us.”

The authors produced an open-source package that implements the new approach, and website links and code are included in their paper. “The reason I’m excited for this,” Price says, “is that it’s pointing out a mistake that matters, fixing it, and laying the groundwork for future work.”

This paper is just the first step. Next, through “data fusion,” the team will add ancient DNA and other data to radiocarbon dates for even more reliable demographic reconstructions. “That’s the long-term plan,” Price says. And it could help resolve a second issue with the dates as data approach: A “bias problem” if and when radiocarbon dates are skewed toward a particular time period, leading to inaccurate analyses.

But that’s a topic for another paper.


Research illuminates inaccuracies in radiocarbon dating


More information:
Michael Holton Price et al, End-to-end Bayesian analysis for summarizing sets of radiocarbon dates, Journal of Archaeological Science (2021). DOI: 10.1016/j.jas.2021.105473
Provided by
Santa Fe Institute

Citation:
Scientists develop a statistical fix for archaeology’s dating problem (2021, September 15)
retrieved 15 September 2021
from https://phys.org/news/2021-09-scientists-statistical-archaeology-dating-problem.html

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part may be reproduced without the written permission. The content is provided for information purposes only.



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