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The best Wi-Fi systems for heavy use on multiple devices - Business Insider - Business Insider
These are the absolute best Wi-Fi routers and systems for homes with heavy amounts of internet use with many devices.
When you buy through our links, we may earn money from our affiliate partners. Learn more. Amazon We're all spending a lot of time at home, and that may also include having more family members in the household at one time. If everyone in the house is trying to get online for work, online classes, the latest Netflix binge, or a Zoom marathon at the same time, that can put some serious strain on your network. Some hardware can handle it, but a lot can't. If you're trying to get a Wi-Fi system that can keep up, there are more than a few on the market that'll do the job. As long as you've got a home internet plan that has the bandwidth, a simple change of routers in your home can fix the slowdowns you might be experiencing. We've picked out well-received products that have specs and features that make them solidly suited to the demands of many devices and heavy use. For big homes, that may mean mesh Wi-Fi systems that feature many nodes. For close quarters, that may be the latest Wi-Fi 6 router with a quad-core processor inside. We'll guide you through our selections, highlighting the features that make each a standout device to support your home network.
Are hiccups a symptom of COVID-19? It's possible, but not well studied - Business Insider - Business Insider
Experts say there's a plausible connection between hiccups and COVID-19. But the link is still tenuous.
Doctors at Cook County Health's Department of Emergency Medicine reported an unusual case of COVID-19 in April: A patient whose main symptom appeared to be hiccups. The 62-year-old man had arrived at the ER after hiccuping for four days straight, with no idea as to why. He'd also lost 25 pounds over four months. Thinking the man might have a tumor between his lungs, the doctors gave him a chest X-ray. Instead, the scans showed "ground-glass," a common characteristic in COVID-19 patients' lungs that causes them to appear cloudy on a scan. They tested the man for COVID-19; he was positive. A similar story played out in another case study published in June, which has not been peer reviewed. A 64-year-old man came to the emergency room with persistent hiccups and wheezing. His doctors did a chest X-ray, saw ground-glass patterns, then tested the patient for COVID-19. He was positive, too. The question both of these case studies explore — are persistent hiccups a symptom of COVID-19? — doesn't yet have a solid answer. Other than these two examples, the association between hiccups and the new coronavirus has not been studied much. "My overall take is, it's hard to say," Aparajita Singh, a gastroenterologist at University of California San Francisco, told Business Insider, adding, "I can see why many people would be interested in trying to research this question and trying to find an association, because hiccups are very, very common." Still, she said, the existing evidence so far is "very low-quality." The coronavirus can irritate the digestive system According to the health information site Healthline, "Is hiccups a sign of COVID-19?" was a trending topic for weeks last month. Singh said it's plausible that hiccups could be a sign of COVID-19 for some patients, based on what we know about how the virus and digestive system interact. Research has shown that the virus can lead to gastrointestinal problems: One study found that of 204 patients with COVID-19, 103 reported some kind of gastrointestinal symptom. The most common were diarrhea and loss of appetite. Six of those patients had no respiratory symptoms at all — only gastrointestinal ones. A CDC study, similarly, found that approximately half of patients had gastrointestinal symptoms, including diarrhea and vomiting. If the coronavirus irritates the gastrointestinal tract, it may also impact the phrenic nerve, which controls the diaphragm. An irritated phrenic nerve can cause involuntary contractions of the diaphragm — also known as hiccups. "Anytime the GI tract is affected, it's biologically plausible that you could end up with the hiccups," Lisa Maragakis, senior director of infection prevention at the Johns Hopkins Health System, told Business Insider. Researchers still don't know whether hiccups and COVID-19 are related To determine for sure whether there really is a connection between infection and hiccups, scientists would need more than a couple of case studies — ideally double-blind trials. Singh noted that in the two cases described, other factors could be at play: The man in the Cook County case study had low sodium levels, for example, which can also cause hiccups. So far, none of the larger analyses of COVID-19's gastrointestinal symptoms have included hiccups. But Singh said the two case studies have piqued her interest nonetheless. "I would be watching out for this symptom more, following the literature," she said. "But I would not add this to my list of symptoms right away." Maragakis said she encourages people who have lasting, unusual symptoms like persistent hiccups, to "err on the side of caution and get tested." But she added that there's a fine line between being careful and unnecessarily anxious. "Once you try to be vigilant of any symptoms, each of us have things we wonder about each day," she said. Loading Something is loading.
Photographer Captures Eerie And Majestic Sky 'Jellyfish' During a Storm - ScienceAlert
A thunderstorm can sometimes birth a rarely seen phenomenon in Earth's atmosphere: red space lightning called sprites that look like jellyfish.
If you've ever looked up during a thunderstorm and glimpsed a red jellyfish sitting high in the sky, you weren't hallucinating. These tentacle-like spurts of red lightning are called sprites. They're ultrafast bursts of electricity that crackle through the upper regions of the atmosphere — between 37 and 50 miles up in the sky — and move towards space, according to the European Space Agency. The phenomenon is a rare sighting: It lasts just tenths of a second and can be hard to see from the ground since it's generally obscured by storm clouds. But Stephen Hummel, a dark-skies specialist at the McDonald Observatory, captured a spectacular image of one of these sprites on July 2 (shown above) from a ridge on Mount Locke in Texas. "Sprites usually appear to the eye as very brief, dim, grey structures. You need to be looking for them to spot them, and oftentimes I am not certain I actually saw one until I check the camera footage to confirm," Hummel told Business Insider. On the night he snapped this photo, he'd recorded 4 1/2 hours of footage before capturing the sprite on film. "Overall I've probably recorded close to 70 hours' worth of footage and stills this year, and caught about 70 sprites," he said, adding that half of those were in a single storm. Jellyfish sprites can be seen glimpsed from space Davis Sentman, a professor of physics at the University of Alaska who died in 2011, proposed the name "sprite" for this type of weather phenomenon. He said the name was "well suited to describe their appearance," since the word evokes the lightning's fairy-like, fleeting nature. Some sprites, like the one Hummel photographed, are jellyfish-shaped. Others are just vertical columns of red light with tendrils snaking down: these are called carrot sprites. Jellyfish sprites can be enormous — the one Hummel photographed was "probably around 30 miles long and 30 miles tall," he said. Some can be seen from more than 300 miles away. They occur because when lightning strikes the ground, it tends to release positive electrical energy that needs to be balanced out by equal and oppositely charged energy elsewhere in the sky. So sprites are the electrical discharges that balance the equation. "The more powerful the storm and the more lightning it produces, the more likely it is to produce a sprite," Hummel said. While similar to regular lightning, which shoots between electrically charged air, clouds, and the ground, sprites happen much farther from Earth's surface. Astronauts sometimes spot them from the International Space Station. Astronauts glimpse a red lightning sprite below the white light of an active thunderstorm from aboard the International Space Station, August 2015. NASA As a sprite sparks, it turns red because of nitrogen floating high in Earth's atmosphere. The gas gets excited by the burst of electricity and emits a red glow. —Paul M Smith (@PaulMSmithPhoto) April 21, 2019 Since the sprites' discovery in 1989, scientists have spotted them over every continent except Antarctica. Dave Mosher contributed reporting to this story.
Yep, Starlink Totally Photobombed a Beautiful Image of Comet Neowise - ScienceAlert
Elon Musk's growing constellation of internet satellites has been sending streaks of bright light across night skies around the world. Even the biggest comet to pass Earth in 25 years wasn't spared.
Elon Musk's growing constellation of internet satellites has been sending streaks of bright light across night skies around the world. Even the biggest comet to pass Earth in 25 years wasn't spared. A striking photo showing Comet Neowise behind those streaks of light shows how easily the satellites can upstage observations of distant objects in space. The satellite project, called Starlink, is Musk's plan to blanket Earth in high-speed satellite internet. The effort has drawn criticism from professional and amateur astronomers, however, because the bright satellites can mar the skies and disrupt telescope observations. Trail of Starlink satellites in front of Comet Neowise. (Daniel Lopez) That's what happened to the astrophotographer Daniel López on July 21, when he was shooting Comet Neowise before it flies out of view for another 6,800 years. He shared the resulting image on the Facebook page of his photography company, El Cielo de Canarias, saying it was a shame to see the satellites make such a spectacle. López's photo is a composite of 17 images taken in the span of 30 seconds. Each image was long exposure, meaning it captured the comet over several seconds. The astronomer Julien Girard shared the picture on Twitter, saying the satellites had "completely photobombed" the comet. "Two of my pictures the other night were also bombed by a Starlink," Girard said. López also shared the time-lapse video behind the picture. He added that traces of the satellites were visible in 20 of his images. Because it's a composite time-lapse photo, the image doesn't show what you would see with the naked eye. But it illustrates why many astronomers worry about the threat that satellite constellations like Starlink pose to ground-based astronomy. Long-exposure images are a crucial part of studying distant objects in the night sky. Telescopes on Earth watch celestial targets for hours, slowly building up a detailed image that offers astronomers rich data. But one poorly timed Starlink satellite can ruin that kind of research by creating a long streak across the image and blocking the objects that astronomers want to study. "In that couple of seconds, a whole 10- or 15-minute exposure is ruined," the astronomer Jonathan McDowell told Business Insider in June. SpaceX is sharing Starlink's orbital-path data with astronomers so that they can plan their telescope observations around the satellites' movements. Briefly shutting off the camera as the satellite passes overhead can save a long-exposure image. But Musk's ambitions could make it nearly impossible to avoid the fast-moving satellites. SpaceX has sought government permission to put a total of 42,000 satellites into orbit to form a "megaconstellation" around Earth. "If they're coming over all the time, then knowing when they're coming over isn't helpful," McDowell said. Even now, he added, sometimes astronomers can't avoid the photobombers. SpaceX isn't the only company building a massive fleet of satellites. Companies like OneWeb and Amazon have similar ambitions. "The sky will not be what it has been for millions of years. Thousands of dots will appear and disappear in the night sky," López told Gizmodo. "I personally think that if no action is taken, it will be the end of astronomy as we know it from the surface of the Earth." Professional astronomers have given similarly dire warnings. "The night sky is for everybody. It has been scrutinised and used for millennia," Girard said. "We should cherish it and protect it just like our Earth." This article was originally published by Business Insider. More from Business Insider:
Mesmerising Animation Reveals Our Entire Solar System Doesn't Exactly Orbit The Sun - ScienceAlert
Jupiter, Saturn, and the sun play a constant game of tug-of-war around the invisible center of our solar system called the barycenter.
It's common knowledge that the sun is the center of the solar system. Around it, the planets orbit — along with a thick belt of asteroids, some meteor fields, and a handful of far-traveling comets. But that's not the whole story. "Instead, everything orbits the solar system center of mass," James O'Donoghue, a planetary scientist at the Japanese space agency, JAXA, recently explained on Twitter. "Even the sun." That center of mass, called the barycenter, is the point of an object at which it can be balanced perfectly, with all its mass distributed evenly on all sides. In our solar system, that point rarely lines up with the center of the sun. To demonstrate this, O'Donoghue created the animation below, which shows how the sun, Saturn, and Jupiter play tug-of-war around the barycenter, pulling our star in looping mini-orbits. In his free time, O'Donoghue makes animations to show how the physics of planets, stars, and the speed of light work. "The natural thinking is that we orbit the sun's center, but that very rarely happens," he said. "It's very rare for the solar system's center of mass to align with the sun's center." The sun's movement is exaggerated in the video above to make it more visible, but our star does circle millions of kilometers around the barycenter — sometimes passing over it, sometimes straying away from it. Much of that movement comes from Jupiter's gravity. The sun makes up 99.8% of the solar system's mass, but Jupiter contains most of the remaining 1.2%. That mass pulls on the sun ever so gently. "The sun actually orbits Jupiter slightly," O'Donoghue said. Within the solar system, planets and their moons have their own barycenter. Earth and the moon do a simpler dance, with the barycenter remaining inside Earth. O'Donoghue made a video of that, too: The animation also shows how the Earth and moon will move over the next three years, in 3D. (The distance between Earth and the moon is not to scale.) Pluto and its moon, Charon, do something similar, but with a unique twist: The barycenter is always outside of Pluto. So, every planetary system orbits an invisible point, including the star or planet that appears to be at the center. Barycenters sometimes help astronomers find hidden planets circling other stars, since they can calculate that the system contains mass they can't see. "The planets do orbit the sun of course," O'Donoghue said. "We are just being pedantic about the situation."
Watch Friday's 'Strawberry Moon' Darken With a Partial Penumbral Eclipse - ScienceAlert
This year's "strawberry moon" will partially pass through Earth's outer shadow. You can watch it online.
June's full moon — also known as the "strawberry moon" because it comes during strawberry season — might look a little darker than normal on Friday. That's because many parts of the world will be able to see a celestial event known as a partial penumbral eclipse, when part of the moon moves through the Earth's outer shadow. This makes a chunk of the moon appear dimmer. The strawberry-moon eclipse will be visible above Asia, Australia, Europe, and Africa. People in the US won't see it but can watch the event via livestream. The moon will be at its fullest on Friday at 3:12 p.m. ET, and the Virtual Telescope Project is set to livestream the eclipse from Italy starting at 3 p.m. ET, as the moon dims above Rome's skyline. You can watch below. The moon will appear full for about three days, from early Thursday morning into early Sunday morning. While the partial penumbral eclipse won't have any major influence on Earth, it can affect some spacecraft. "For spacecraft at the moon such as the Lunar Reconnaissance Orbiter, the reduction in solar power is noticeable," NASA wrote in a release about the strawberry moon. A full strawberry moon rise above Lisbon, Portugal, on June 2, 2015. AP/Armando Franca June's full moon will be the last of the spring. The strawberry moniker comes from the Algonquin tribes. An old European name for this final spring full moon, meanwhile, is the "mead moon" or the "honey moon," since people considered honey to be the sweetest during June. (Mead is an alcoholic drink made from fermented honey.) During the Middle Ages, many couples in Europe also got married in June (as plenty still do today), so that might be where the tradition of calling the first month of marriage the "honeymoon" comes from.
South Korea reports coronavirus cases 'reactivated,' but it's unlikely - Business Insider - Business Insider
Health authorities said 51 COVID-19 patients in recovery tested negative then positive again within a "relatively short time." It's not clear how.
South Korea reported this week that 51 patients who had recovered from the coronavirus and tested negative later tested positive again. Jeong Eun-kyeong, director-general of the Korea Centers for Disease Control and Prevention, said in a briefing on Monday that the virus may have "reactivated" in those patients after going dormant. He said tests were conducted within a "relatively short time" after the patients were cleared, so it's unlikely they got reinfected. "While we are putting more weight on reactivation as the possible cause, we are conducting a comprehensive study on this," Jeong said. "There have been many cases when a patient during treatment will test negative one day and positive another." Most experts think it's unlikely that the virus reactivates after a "dormancy" period. Only a few types of viruses do that — it's sometimes called going latent — as part of their life cycles inside a cell. HIV and herpes are two examples. It's more likely that the people in South Korea still had fragments of the coronavirus in their bodies after they recovered. Such fragments don't mean the patients are still infectious or sick, but they can still show up in a nucleic acid test, Dr. Keiji Fukuda, director of Hong Kong University's School of Public Health, told the Los Angeles Times last month. "The test may be positive, but the infection is not there," Fukuda said. Reactivation versus reinfection Over 315,000 people worldwide have recovered from the coronavirus (likely more, given that many mild and asymptomatic cases are not reported in official counts). Generally, once your body has antibodies to fight off a particular disease, you can't get it again. Dr. Anthony Fauci discussed coronavirus immunity during livestreamed conversation with Journal of the American Medical Association editor Howard Bauchner on Wednesday. Fauci said it's unlikely that people can get the coronavirus more than once — at least within a short time period. "If a person gets infected with coronavirus A, and then gets reinfected with a coronavirus, it may be coronavirus B," Fauci said. "But right now, we don't think that this is mutating to the point of being very different." This scanning electron microscope image shows the SARS-CoV-2 virus (yellow) — the new coronavirus' scientific name — emerging from the surface of cells (blue/pink) cultured in a lab. NIAID-RML With viruses that mutate — such as the common cold or seasonal flu — antibodies people build up against one strain aren't effective against others. Plus, some types of antibodies weaken over time. Viruses that cause persistent infections, meanwhile, can have latency periods and reactivate as part of their life cycles. After an initial infection, these viruses stay inside of host cells, neither replicating nor shedding until they're reactivated. Chickenpox, for example, usually occurs in children but can reactivate in adults as shingles. But in general, this is not common for viruses. Latent viral infections also differ from chronic viral infections, such as hepatitis C. The outbreak in South Korea The Korean CDC is conducting an epidemiological probe into the patients who retested positive. "There have been many cases when a patient during treatment will test negative one day and positive another," Jeong said. In South Korea, patients are declared recovered after two negative nucleic acid tests 24 hours apart. South Korean soldiers wearing protective gear walk on a street in front of Daegu's city hall after a rapid rise in cases of the coronavirus, March 2, 2020. REUTERS/Kim Kyung-Hoon However, false negatives and false positives are possible . South Korea had one of the earliest large-scale outbreaks of COVID-19 outside of China. But it peaked at the end of February, thanks in part to the country's wide-scale testing and digital contact tracing. It has only seen roughly 200 deaths and 10,400 cases in total, with a relatively small number of new infections per day over the last month. Loading Something is loading.