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“We think this process of counterfactual simulation is really pervasive,” Gerstenberg says. “In many cases it may not be supported by eye movements, because there are many kinds of abstract counterfactual thinking that we just do in our mind. But the billiard-ball collisions lead to a particular kind of counterfactual simulation where we can see it.”

Microscopic organisms don’t make for good alien villains, but our chances of discovering extraterrestrial microbial life seem better than encountering advanced alien civilizations, Varnum says. In recent years, more and more scientists have begun to suspect that microbes may exist on moons in our solar system, in the subsurface oceans of Europa and Enceladus and the methane lakes of Titan.

In every case, the text-analysis software showed that people, journalists and non-journalists alike, seemed to exhibit more positive than negative emotions in response to news of extraterrestrial microbes.

In general, media mentions and their predictive abilities are imperfect measures. Text-analysis software itself has some gaps; the program can’t, for example, detect sarcasm.

“A lot of worldviews, both religious and secular, have shown themselves to be pretty flexible,” Varnum says. “The Catholic Church eventually made peace with a heliocentric solar system, right?”

McGinn suspects that the reason why philosophical conundrums such as the mind/body problem – how physical processes in our brain give rise to consciousness – prove to be intractable is that their true solutions are simply inaccessible to the human mind.

Is a question still a “mystery” if you have arrived at the correct answer, but you have no idea what it means or cannot wrap your head around it? Mysterians often conflate those two possibilities.

Most importantly, we can extend our own minds to those of our fellow human beings. What makes our species unique is that we are capable of culture, in particular cumulative cultural knowledge. A population of human brains is much smarter than any individual brain in isolation.

It is quite true that we can never rule out the possibility that there are such unknown unknowns, and that some of them will forever remain unknown, because for some (unknown) reason human intelligence is not up to the task. But the important thing to note about these unknown unknowns is that nothing can be said about them. To presume from the outset that some unknown unknowns will always remain unknown, as mysterians do, is not modesty – it’s arrogance.

Some estimated that the CDC had reported more than 20% of COVID-19 cases as of March 15, but others predicted that the agency had identified just 5% of cases. Some predicted that the US could see 1 million deaths by the end of 2020, while others predicted that the death toll would be in the thousands.

The New York Times recently used CDC data to model how the how the virus could spread if no actions were taken to stop transmission in the US. The models show that between 160 million and 214 million people could be infected and as many as 200,000 to 1.7 million people could die.

Even if all patients were able to receive treatment at hospitals, however, the researchers predicted that about 1.2 million people in the US could die.

But since this particular coronavirus hasn't been seen before in humans, scientists aren't certain whether it will behave the same way. Plus, it's spreading in places with high temperatures, like Australia.

A second outbreak could also arise after people resume normal activity. The US asked citizens to avoid international travel starting March 19, but opening its borders again could fuel the virus' spread. The same goes for allowing citizens to return to work or use mass transit.

Those speech abilities could include distinct vowels and consonants, syllables, or even syntax—all of which, according to LDT, should be impossible for any animal without a human vocal tract.

As John Locke, a linguistics professor at Lehman College, put it, “Motor control rots when you die.” Soft tissues like tongues and nerves and brains generally don’t fossilize; DNA sequencing is impossible past a few hundred thousand years; no one has yet found a diary or rap track recorded by a teenage Australopithecus.

One of the quantitative models the new study relies on, he says, doesn’t properly represent the shape of the larynx, tongue, and other parts we use to talk: “It would convert a mailing tube into a human vocal tract.” And according to Lieberman, laryngeal descent theory “never claimed language was not possible” prior to the critical changes in our ancestors’ throat anatomy. “They’re trying to set up a straw man,” he said.

Rather than 27 million years, Hickok proposes that the earliest bound on any sort of speech ability would be nearer to human ancestors’ split with the Pan genus, which includes chimpanzees and bonobos, our closest living relatives. That split happened about 5 million to 7 million years ago—certainly longer than 200,000 years, but a far cry from 27 million. Lieberman argues that the precursors of speech might have emerged about a little more than 3 million years ago, when artifacts like jewelry appear in the archaeological record. The idea is that both language and jewelry are intimately related to the evolution of symbolic thinking.

Meanwhile, 2019-nCoV, which causes symptoms similar to the flu, has killed about 2% of the 31,500 people it has infected so far, but has spread to more than 20 countries—including, crucially (at least in terms of understanding media coverage), the U.S. Any time an issue affects the U.S., the Western press kicks into high gear, Miller says.

After the 2014-2016 Ebola outbreak, the U.S. press was criticized for overstating the possible threat to Americans.

In the late 1900s, researchers discovered that mitochondria were free-living bacteria at some point in the past. Somehow they were drawn inside another cell, providing new fuel for their host. In 2015, Thijs Ettema of Uppsala University in Sweden and his colleagues discovered fragments of DNA in sediments retrieved from the Arctic Ocean. The fragments contained genes from a species of archaea that seemed to be closely related to eukaryotes.Dr. Ettema and his colleagues named them Asgard archaea. (Asgard is the home of the Norse gods.) DNA from these mystery microbes turned up in a river in North Carolina, hot springs in New Zealand and other places around the world.

Masaru K. Nobu, a microbiologist at the National Institute of Advanced Industrial Science and Technology in Tsukuba, Japan, and his colleagues managed to grow these organisms in a lab. The effort took more than a decade.The microbes, which are adapted to life in the cold seafloor, have a slow-motion existence. Prometheoarchaeum can take as long as 25 days to divide. By contrast, E. coli divides once every 20 minutes.

In the lab, the researchers mimicked the conditions in the seafloor by putting the sediment in a chamber without any oxygen. They pumped in methane and extracted deadly waste gases that might kill the resident microbes.The mud contained many kinds of microbes. But by 2015, the researchers had isolated an intriguing new species of archaea. And when Dr. Ettema and colleagues announced the discovery of Asgard archaea DNA, the Japanese researchers were shocked. Their new, living microbe belonged to that group.The researchers then undertook more painstaking research to understand the new species and link it to the evolution of eukaryotes.The researchers named the microbe Prometheoarchaeum syntrophicum, in honor of Prometheus, the Greek god who gave humans fire — after fashioning them from clay.

This finding suggests that the proteins that eukaryotes used to build complex cells started out doing other things, and only later were assigned new jobs.Dr. Nobu and his colleagues are now trying to figure out what those original jobs were. It’s possible, he said, that Prometheoarchaeum creates its tentacles with genes later used by eukaryotes to build cellular skeletons.

Before the discovery of Prometheoarchaeum, some researchers suspected that the ancestors of eukaryotes lived as predators, swallowing up smaller microbes. They might have engulfed the first mitochondria this way.

Instead of hunting prey, Prometheoarchaeum seems to make its living by slurping up fragments of proteins floating by. Its partners feed on its waste. They, in turn, provide Prometheoarchaeum with vitamins and other essential compounds.

When we read fiction, we practice keeping our minds open because we can afford uncertainty

100 people were assigned to read a fictional story or a nonfiction essay. The participants then completed questionnaires intended to assess their level of cognitive closure, which is the need to reach a conclusion quickly and avoid ambiguity in the decision-making process. The fiction readers emerged as more flexible and creative than the essay readers—and the effect was strongest for people who read on a regular basis.

They saw themselves differently after reading about others' fictional experience.

As you identify with another person, a protagonist in the story, you enter into a piece of life that you wouldn't otherwise have known. You have emotions or circumstances that you wouldn't have otherwise understood

“We cannot rationally deny that we will die, but we think of it more as something that happens to other people.”

Arnaud Wisman, a psychologist at the University of Kent, said people put up numerous defences to stave off thoughts of death. The young in particular may see it as a problem for other people, he said

To do this they have been focusing on the sensory pathways linked to these deep structures. She and her group discovered that adults with dyslexia have weaker pathway connections between a visual subcortical structure (the left visual thalamus) with an area of the cortex called V5/MT, which is critical for the perception of visual motion. In the auditory mode, there was a similar finding. The team discovered weaker connections between the left auditory thalamus and a cortex structure linked to auditory motion, which is important for speech perception. These connections could therefore be important for reading and for predicting reading skill, according to Dr von Kriegstein.

So how might this translate into helping people with dyslexia? This is basic science, says Prof. von Kriegstein, so first it’s crucial to understand the mechanisms behind communications disorders before developing therapy training tools, although she is optimistic these could lie within reach.

The way the brain encodes information and in turn directs perception of that sensory experience is a highly variable process.

The sensory overload or distorted and heightened perceptions described by schizophrenia patients, for instance, could relate to these deficits. Sensory dysfunction has also been linked to delusions and hallucinations as well as difficulties with attention and reading the emotions or tone of others – all of which can affect social interaction.

According to Dr Fellin, decreased connectivity between nerve cells (neurons) appears to play an important role in the progression of schizophrenia. So far, Dr Fellin and his group have identified which specific neurons influence sensory responses in mouse studies, but not yet in animal models of schizophrenia, with similar investigations in glial cells  - the supporting cells of the nervous system.

Perinatal Depression

Seasonal Affective Disorder (SAD):

Psychotic Depression:

Depression can occur along with other serious illnesses, such as diabetes, cancer, heart disease, and Parkinson’s disease. Depression can make these conditions worse and vice versa.

Depression affects different people in different ways.

Medications called antidepressants can work well to treat depression.

"This is a huge endeavor for the human species, and it'll take cooperation from more than just our own space program," Stack said. "Once the resources are there, we can develop the technology. It's getting the buy-in from international partners and from our own space administration and government to really make this happen."

No matter the mission, sticking the landing is key for future success. The 2020 rover will land on Mars using the new Terrain Relative Navigation system, which allows the lander to avoid any large hazards in the landing zone.

Astronauts exploring Mars will need oxygen, but carting enough to sustain them on a spacecraft isn't viable. The Mars 2020 rover will carry MOXIE on board, or the Mars Oxygen In-Situ Resource Utilization Experiment.

Speaking of "The Martian," the events of the book and its film adaptation are set in motion when a surprise, devastating dust storm impacts astronauts on the Red Planet. Understanding the weather and environment on Mars will be crucial for determining the conditions astronauts will face.

For the first time, a surface mission will include a ground-penetrating radar instrument called RIMFAX, or Radar Imager for Mars' Subsurface Experiment. It will be able to peek beneath the surface and study Martian geology, looking for rock, ice and boulder layers. Scientists hope that RIMFAX will help them understand the geologic history of Jezero Crater, according to David Paige, principal investigator for the experiment at the University of California, Los Angeles.