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Johnniehoria

15 Sep 2024 - 01:46 am

Study shows how the pandemic may have affected teens’ brains
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The pandemic’s effects on teenagers were profound — numerous studies have documented reports of issues with their mental health, social lives and more.

Now, a new study suggests those phenomena caused some adolescents’ brains to age much faster than they normally would — 4.2 years faster in girls and 1.4 years faster in boys on average, according to the study published Monday in the journal Proceedings of the National Academy of Sciences.

By being the first to contribute details on aging differences by sex, the study adds to the existing body of knowledge provided by two previous studies on the Covid-19 pandemic and accelerated brain aging among adolescents.
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“The findings are an important wake-up call about the fragility of the teenage brain,” said senior study author Dr. Patricia K. Kuhl, the Bezos Family Foundation Endowed Chair in Early Childhood Learning and codirector of the Institute for Learning and Brain Sciences at the University of Washington in Seattle, via email. “Teens need our support now more than ever.”

Significant socioemotional development occurs during adolescence, along with substantial changes to brain structure and function. The thickness of the cerebral cortex naturally peaks during childhood, steadily decreases throughout adolescence and continues to decrease through one’s lifespan, the authors wrote.

The researchers originally intended to track ordinary adolescent brain development over time, starting with MRIs the authors conducted on participants’ brains in 2018. They planned to follow up with them for another scan in 2020.

The pandemic delayed the second MRI by three to four years — when the 130 participants based in Washington state were between ages 12 and 20. The authors excluded adolescents who had been diagnosed with a developmental or psychiatric disorder or who were taking psychotropic medications.

Williamved

15 Sep 2024 - 12:13 am

Long-lost copy of the US Constitution, found in North Carolina filing cabinet, heads to auction
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Historical document appraiser and collector Seth Kaller spreads a broad sheet of paper across a desk. It’s in good enough condition that he can handle it, carefully, with clean, bare hands. There are just a few creases and tiny discolorations, even though it’s just a few weeks shy of 237 years old and has spent who knows how long inside a filing cabinet in North Carolina.

At the top of the first page are familiar words but in regular type instead of the sweeping Gothic script we’re used to seeing: “WE, the People …”

And the people will get a chance to bid for this copy of the US Constitution — the only of its type thought to be in private hands — at a sale by Brunk Auctions on Sept. 28 in Asheville, North Carolina.
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The minimum bid for the auction of $1 million has already been made. There is no minimum price that must be reached.

This copy was printed after the Constitutional Convention finished drafting the proposed framework of the nation’s government in 1787 and sent it to the Congress of the ineffective first American government under the Articles of Confederation, requesting they send it to the states to be ratified by the people.

It’s one of about 100 copies printed by the secretary of that Congress, Charles Thomson. Just eight are known to still exist and the other seven are publicly owned.

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14 Sep 2024 - 09:52 pm

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14 Sep 2024 - 09:36 pm

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14 Sep 2024 - 11:04 am

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14 Sep 2024 - 09:31 am

A series of cosmic outbursts
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Pons-Brooks recently captured the attention of astronomers after exhibiting intriguing behavior that caused the comet to have a horned appearance and soar through our solar system.
The comet has experienced a number of outbursts during the past eight months, causing it to eject gas and dust. While such releases are not uncommon in comets and a crescent or Pac-Man shape has been observed in other ones, it’s difficult to tell what is normal for Pons-Brooks.
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“I would say it’s somewhat unusual in the number of outbursts it’s been having,” Schleicher said. “On the other hand, it’s not like you have good records from the past to really let you know what is typical. And I suspect given the fairly large number of outbursts that have happened over the last eight months, that this is very clearly a usual occurrence for Pons-Brooks.”

Comets are chunks of dust, rock and ice, essentially frozen remnants from the formation of the solar system. They also contain frozen elements such as carbon dioxide and carbon monoxide.

Comets heat up and brighten as they approach the sun, and some of the frozen gases stored in comets don’t need to warm up much before they begin to turn into vapor, Schleicher said.

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14 Sep 2024 - 09:30 am

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