David Freeman
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David Freeman is the senior science editor of The Huffington Post in New York City and the host of Science Insider, a weekly radio program on an NPR station in Sharon, CT.

Entries by David Freeman

「プラス思考」やり方を間違えると、うつの症状を悪化させる可能性も(調査結果)

(0) Comments | Posted February 5, 2016 | 1:47 AM

ふさわしい方法のプラス思考とは?

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긍정적인 사고는 오히려 부정적인 결과를 가져올 수 있다(연구)

(0) Comments | Posted February 3, 2016 | 7:16 PM

긍정적인 사고의 힘 이야기는 이제 그만.

낙관적인 판타지가 기분을 좋게 만든다고들 하지만, 장기적으로는 우울증 증상을 악화시킬 수 있다는 놀라운 새 연구가 나왔다.

“긍정적인 사고가 나쁘거나, 부정적인 사고가 좋다는 것은 아니다.” 이번 연구에 참여한 과학자 중 하나인 뉴욕 대학교 심리학 교수 가브리엘 외팅겐의 말이다. “긍정적인 사고와 판타지를...

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The Surprising Way Ships' Wakes Could Help Ease Global Warming

(1) Comments | Posted February 2, 2016 | 12:09 PM


The shipping industry gets blamed for its share of environmental ills, from air and water pollution to collisions that kill whales and other marine animals.


But in a new paper published last week in the Journal of Geophysical Research: Atmospheres, scientists argue that the

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Positive Thinking May Come With A Very Big Negative

(0) Comments | Posted February 1, 2016 | 4:20 PM


So much for the power of positive thinking.


Surprising new research suggests that indulging in upbeat fantasies may exacerbate symptoms of depression in the long run, even if it gives a boost to one's mood in the here and now.


"It's not that positive...

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당신은 티라노사우루스의 추격을 따돌릴 수 있을까?

(0) Comments | Posted January 30, 2016 | 7:47 PM

tyrannosaur

티라노사우루스 렉스(이하 티렉스)는 거대하고 육중해서 진흙에 남긴 발자국을 아직도 화석으로 볼 수가 있다. 그러나 티렉스는 원하기만 한다면 더 빨리 움직일 수도 있었다.

이렇게 말해보자. 당신이 백악기로 시간여행을 떠났다가 굶주린 티렉스와 마주쳤다. 과연 당신은 티렉스를 따돌릴 수 있을까?

만약 와이오밍에서 발견된 공룡들의 발자국을 연구한 최근 기사의 헤드라인을...

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We're Losing The War On Bedbugs

(4) Comments | Posted January 29, 2016 | 3:11 PM


In the ongoing battle between bedbugs and the humans whose blood they suck, it seems the bugs may be winning -- at least in some parts of the country.


New research conducted on bedbugs from homes in Cincinnati, Ohio, Jersey City, New Jersey, and Troy,...

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Bill Nye Has A Brilliant Idea To Transform NASCAR

(2) Comments | Posted January 29, 2016 | 11:27 AM


Has the time come for NASCAR to go green -- and help save the world?


Bill Nye thinks so. In an emotional new blog post, America's beloved "Science Guy" urges the popular stock car racing series to replace the "ancient tech" internal combustion engines that...

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Here's The Real Story Of Whether You Could Outrun T. Rex

(0) Comments | Posted January 26, 2016 | 12:12 PM


Let's say you travel back in time to the Cretaceous Period and find yourself face to face with a hungry tyrannosaur. Can you outrun the beast?


If you believe the headline atop an article describing new research on a set of dinosaur footprints in present-day Wyoming, maybe...

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'Bombshell' Study Shows Our Brains Are Even More Awesome Than We Knew

(0) Comments | Posted January 21, 2016 | 10:42 PM

In a finding they're calling a "real bombshell in the field of neuroscience," researchers have uncovered evidence that the human brain's memory capacity is an order of magnitude greater than previously thought.

"Our new measurements of the brain's memory capacity increase conservative estimates by a factor of 10 to at least a petabyte," Dr. Terry Sejnowski, a professor at the Salk Institute in La Jolla, California, and co-senior author of a paper describing the research, said in a written statement.

In other words, the human brain may be able to store one petabyte of data, which is 1 quadrillion bytes. That's enough memory to store 13.3 years of high-definition video.

The finding, published recently in the journal eLife, is considered preliminary and must be confirmed by future research. But it constitutes a significant advance in our understanding of neuroanatomy and could prove to be a step toward the creation of a complete "wiring diagram" of the human brain, Sejnowsky told The Huffington Post.

In addition, the finding could point the way to a new generation of computers that combine enormous processing power with low energy consumption. Such "probabilistic" computing devices -- so called because they process data in a way that is more intuitive than conventional computers -- are considered a game-changer for applications ranging from translation to machine vision.

We have to think of the brain not as an old grandfather clock but as a high-precision watch."

Sejnowski and his collaborators at Salk and the University of Texas at Austin made the discovery as part of a detailed anatomical examination and subsequent 3D computer reconstruction of the cells within a tiny portion of tissue from the brain of a rat. 

The reconstruction showed that the variation in the sizes of the synapses within the sample -- the tiny gaps between brain cells that are known to be key to memory formation and storage -- was far smaller than previous research had suggested. In fact, the synapses varied in size by only about 8 percent. (Synapses in the rat brain are believed to be similar to those in the human brain.)

"No one thought it would be such a small difference," Dr. Tom Bartol, a staff scientist at the institute and one of the researchers, said in the statement. "This was a curveball from nature."

When the researchers plugged the 8-percent figure into their computer model of the brain, they determined that there must be more than two dozen discrete sizes of synapse rather than just a few. That bigger number, in turn, meant that the synapses must be able to store far more information than anyone knew.

Having more "bits" per synapse is a little like a high-definition TV having more bits per pixel than a conventional TV, Sejnowski said, adding that, "We think the brain is high-resolution now."

Or, offering up another metaphor, he said, "We have to think of the brain not as an old grandfather clock but as a high-precision watch."

Some scientists think that the human brain is capable of storing even more information. The brain's true memory capacity may be even greater -- as much as 3 to 5 petabytes, Dr. Paul Reber, director of the Brain, Behavior, & Cognition program in the psychology department at Northwestern University, told the San Diego Union-Tribune.

Also on HuffPost:

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The Reason We Haven't Found Alien Life May Be A Very Sad One

(9) Comments | Posted January 21, 2016 | 6:57 PM

Australian scientists say they've figured out why we've been unable to detect signs of alien life. And for...

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Tiny Quantum Dots May Spell Doom For Deadly Superbug Infections

(0) Comments | Posted January 19, 2016 | 5:17 PM


Does nanotechnology hold the key to stopping antibiotic-resistant bacteria and the deadly infections they cause?


Scientists in Colorado think it just might. They've developed light-activated nanoparticles -- each roughly 20,000 times smaller than the thickness of a single human hair -- and shown...

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NASA Is Hiring, But Do You Have What It Takes To Be An Astronaut?

(2) Comments | Posted January 18, 2016 | 10:59 AM


For anyone who dreams of becoming an astronaut and blasting off for a deep-space adventure, there's good news and bad news.


The good news is that NASA is hiring. If you make the cut and become an "astronaut candidate," you could earn up...

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This Is What It Looks Like When Galaxies Collide

(1) Comments | Posted January 15, 2016 | 12:23 PM


The Hubble Space Telescope has been responsible for some pretty spectacular photos since it was launched into space 25 years ago, but a new image (above) of a celestial object astronomers call NGC 3597 is definitely one of its standouts.


NGC 3597 is essentially a cosmic mash-up...

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Black Hospital Patients Given Cold Shoulder In Disturbing New Study

(13) Comments | Posted January 8, 2016 | 1:19 PM


Could the color of your skin affect the medical care you get at the end of your life?


A disturbing new study published in the January issue of the Journal of Pain and Symptom Management suggests that it might. The research shows that black actors who...

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What You Should Know About The Drastic Decline Of Wild Bees

(1) Comments | Posted December 23, 2015 | 9:44 AM


We owe a lot to wild bees.


The buzzing insects are crucial pollinators for many agricultural crops, from pumpkins and squashes to peaches and apples. It turns out, however, that wild bee populations are on the decline in some of the main U.S. farmlands that need...

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Super-Colossal Space Tail Is Way Bigger Than The Milky Way

(0) Comments | Posted December 22, 2015 | 1:05 PM

Animals have tails. So do shirts, kites and comets.

But you've never seen a tail like the one...

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Maybe This Is Why Bill Nye Never Became An Astronaut

(0) Comments | Posted December 18, 2015 | 10:33 AM

If Bill Nye loves space so much, how come he's never gone into it?

It's not...

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10 Mind-Boggling Science Facts That Will Make You Feel Grateful

(0) Comments | Posted November 25, 2015 | 12:44 PM


From the farthest reaches of the cosmos to the curious behavior of subatomic particles, science helps us understand our universe. But science can console as well as explain.


How does it do that? By helping us realize that some of our everyday problems are actually pretty puny.

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Novas descobertas sobre a estrutura do DNA podem levar a remédios mais eficazes

(0) Comments | Posted October 28, 2015 | 4:20 PM

Esqueça aquela escadinha estática que você aprendeu na aula de biologia. O DNA está em movimento o tempo todo e fica mudando de forma.

Você não precisa ser biólogo molecular para saber que o ácido desoxirribonucleico (DNA) tem uma estrutura de “dupla hélice”. Mas, se você acha que a molécula da vida não é nada além de “duas cadeias helicoidais enroladas em um mesmo eixo”, como descreveram Watson e Crick em 1953, pense de novo.

Os cientistas sabem agora que as moléculas de DNA se enrolam em si mesmas, formando superespirais bem apertadas, e novas pesquisas sobre os “minicírculos” do DNA realizadas por pesquisadores americanos e europeus mostram que o DNA está em movimento constante, tomando várias formas diferentes.

“Alguns dos círculos tinham cantos agudos, outros formavam um oito, outros pareciam algemas, raquetes ou até mesmo agulhas”, disse em comunicado Rossitza N. Irobalieva, ex-pesquisadora do Baylor College of Medicine e coautora do novo estudo.

“Alguns pareciam varetas, de tão enrolados.”

A descoberta é mais que simplesmente uma curiosidade científica. Os pesquisadores afirmam que ela pode levar a remédios melhores, incluindo drogas para tratar câncer e infecções bacterianas.

“Como algumas terapias anticâncer se conectam com o próprio DNA, e alguns antibióticos alvejam enzimas que reconhecem especificamente os DNA superenrolados das bactérias, esperamos que a pesquisa ajude a melhorar o design dos remédios desde o início do processo”, disse Sarah A. Harris, física teórica da Universidade de Leeds, Inglaterra, e co-autora do estudo.

Como os pesquisadores chegaram a essa nova imagem do DNA? Primeiro, os cientistas do Baylor College of Medicine fizeram pequenos círculos de DNA e usaram uma técnica de microscópio conhecida como tomografia de crioeletrônica para criar imagens detalhadas desses círculos.

Então, os cientistas da Universidade de Leeds usaram um supercomputador para simular como as moléculas se moviam e que forma tomavam.

O estudo, intitulado The Structural Diversity of Supercoiled DNA (a diversidade estrutural das super espirais de DNA, em tradução livre), foi publicado na revista Nature, em 12 de outubro de 2015.

SIGA NOSSAS REDES SOCIAIS:


Este artigo foi originalmente publicado pelo HuffPost US e traduzido do inglês.

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Neil deGrasse Tyson, de 'Cosmos', fala sobre ateísmo, alienígenas e como aprendeu a 'admirar o universo'

(1) Comments | Posted October 27, 2015 | 5:39 PM

"Tudo que sabemos e amamos sobre o universo e todas as leis da física se aplicam a 4% do universo. Isso é impressionante."

As coisas estão indo bem para Neil deGrasse Tyson. Bem mesmo. Como diretor do Hayden Planetarium e autor de vários livros conhecidos sobre...

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