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For now, life is flourishing on our oxygen-rich planet, but Earth wasn't always that way – and scientists have predicted that, in the future, the atmosphere will revert back to one that's rich in methane and low in oxygen.

This probably won't happen for another billion years or so. But when the change comes, it's going to happen fairly rapidly, the study from earlier this year suggests.

This shift will take the planet back to something like the state it was in before what's known as the Great Oxidation Event (GOE) around 2.4 billion years ago.

What's more, the researchers behind the new study say that atmospheric oxygen is unlikely to be a permanent feature of habitable worlds in general, which has implications for our efforts to detect signs of life further out in the Universe.

"The model projects that a deoxygenation of the atmosphere, with atmospheric O2 dropping sharply to levels reminiscent of the Archaean Earth, will most probably be triggered before the inception of moist greenhouse conditions in Earth's climate system and before the extensive loss of surface water from the atmosphere," wrote the researchers in their published paper.

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Chronic rhinosinusitis, which causes a persistent blocked nose and headaches among other symptoms, affects 11 percent of people in the US – and recent research has found a link between the condition and changes in brain activity.

The team behind the study is hoping that the link will help explain some of the other common effects of the persistent inflammation: finding it hard to focus, struggling with bouts of depression, having trouble sleeping, and dizziness.

Finding a connection between the underlying disease and the neural processing happening elsewhere could be vital in understanding the chronic condition, along with efforts to find better and more effective ways to treat it.

"This is the first study that links chronic sinus inflammation with a neurobiological change," said otolaryngologist Aria Jafari, from the University of Washington; the team's paper was published in April 2021.

"We know from previous studies that patients who have sinusitis often decide to seek medical care not because they have a runny nose and sinus pressure, but because the disease is affecting how they interact with the world. They can't be productive, thinking is difficult, sleep is lousy. It broadly impacts their quality of life. Now we have a prospective mechanism for what we observe clinically."

The researchers tapped into data from the Human Connectome Project to find 22 subjects living with chronic rhinosinusitis and 22 control subjects with no sinus inflammation. Data from fMRI scans were then used to compare blood flow and neuron activity in the brain.

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Rogue Planets Could be Habitable

The search for potentially habitable planets is focused on exoplanets—planets orbiting other stars—for good reason. The only planet we know of with life is Earth and sunlight fuels life here. But some estimates say there are many more rogue planets roaming through space, not bound to or warmed by any star.

Could some of them support life?

The term ‘Rogue Planet’ is a colourful term used to describe what are actually interstellar objects (ISOs). But in the case of rogue planets, the ISOs are planetary-mass objects, rather than less massive objects like ‘Oumuamua or 2I/Borisov, the only two confirmed ISOs to enter our Solar System.

Rogue Planets have been somehow ejected from their solar systems. Young solar systems are chaotic places, where bodies collide with each other and where migrating gas giants can perturb smaller terrestrial planets from their orbits, sending them on an interstellar journey. It’s also possible that rogue planets form in interstellar space similar to how stars form. A planet could coalesce out of a cloud of gas and dust, along with a system of moons orbiting it. Sub-brown dwarfs are also considered rogue planets, but since they’re just gas, life is unlikely. In any case, rogue planets aren’t gravitationally bound to any star or stars. They’re free-floating.

We don’t know how many of them there are. If you ask Neil deGrasse Tyson there are billions of them in the Milky Way, maybe even trillions. Could any of them host life? Possibly.

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Portugal’s health care system was on the verge of collapse. Hospitals in the capital, Lisbon, were overflowing and the authorities were asking people to treat themselves at home. In the last week of January, nearly 2,000 people died as the virus spread.

The country’s vaccine program was in a shambles, so the government turned to Vice Adm. Henrique Gouveia e Melo, a former submarine squadron commander, to right the ship.

Eight months later, Portugal is among the world’s leaders in vaccinations, with roughly 86 percent of its population of 10.3 million fully vaccinated. About 98 percent of all of those eligible for vaccines — meaning anyone over 12 — have been fully vaccinated, Admiral Gouveia e Melo said.

“We believe we have reached the point of group protection and nearly herd immunity,” he said. “Things look very good.”

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