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373∆24 Brasil and the world in crisis (draft)

    Temas: Brasil and the world in crisis  ( draft ) Sumário: Miríade e Distopia   (2004-2024)  Em construção: Coletânea de Poesias -   draf...

quinta-feira, 2 de abril de 2020

Running and a long life

02apr20 04mar20
participation in running, regardless of its dose, would probably lead to
substantial improvements in
     population health and    
     longevity.
Any amount of running, even just once a week, is better than no running,
but higher doses of running may not necessarily be associated with greater mortality benefits.

Fourteen studies from six prospective cohorts with a pooled sample of 232 149 participants were included. In total, 25 951 deaths were recorded during 5.5–35 year follow-ups. Our meta-analysis showed that

running participation is associated with
27%, 30% and 23% lower risk of
     all-cause,
     cardiovascular and
     cancer mortality, respectively,
                         compared with no running.

A meta-regression analysis showed no significant dose–response trends for weekly frequency, weekly duration, pace and the total volume of running.

Five tips for teaching online

02ap20 24mar2020
Don’t convert entire lecture to video;
Don’t rely on live video;
Pay attention to engagement and feedback;
Check in with students often;
Identify struggling students and support them

Don’t convert your entire lecture to video. 
“Strategically reduce your goals” . Instructors need to identify a few specific things that they want their students to learn, and focus on those.

Don’t rely on live video. 


Invite student engagement and feedback.
The best online instructors, Reich and Lee agree, set up their courses so that students can pursue self-paced enquiry — exploring the topic under their own initiative. For example, you can give students a range of links for further reading.
Asking students what they hope to get out of the online course, and
how you can best serve them,
       offers instructors ideas for teaching and gives students ownership of the process, he says.


Check in with students often. 
Consider interactive elements such as short quizzes.

Students might also miss on-campus social interaction, so it helps to engage them with opportunities to talk to one another during a live session, says Lee. She groups students into teams of five so that they can support one another. If students have a question about content, they ask their group first, and come to her only if they still can’t get a satisfactory answer. “Make sure students support each other. Don’t try to do everything yourself,” she says.

Identify and support struggling students. 
Reich says that the most successful virtual teachers conduct frequent assessments, and check in by phone, text or e-mail with each student — most often with those who are struggling.
To identify those students, instructors can ask whether class members have adequate Wi-Fi and access to devices, and how concerned they are about the transition to online learning. 

With technological help from colleagues at NYU Shanghai, [Leonardo Rolla] developed a strategy for teaching remotely from the other side of the world.

Each day, using a program called Voice-Thread,
he records several short videos of himself explaining maths concepts,
adding up to 15–30 minutes collectively.

During their day, the students
watch the videos on a website and, in turn,
insert videos they make of their assigned theorem proofs, for example, or
a question,
a comment or
a critique of a classmate’s proof.
Together, Rolla and his students produce an interactive, if asynchronous, class recording.

Working together

Rolla has one crucial tip:
seek constant feedback from students.
“I am the director of this movie,” he says, “but we are all in this together.”
He asks his students precise questions to demonstrate
what they have just learnt and
how each concept builds on their existing base of knowledge.

He also asks for feedback to improve the course.

When students asked for more concrete examples of complex, abstract theorems to make sure they understood the concepts, he obliged.

“The biggest risk is that you become a talking head
     explaining things that students are not following,” he says,
     “and they give up and
     just pretend.”
His video-based approach has earned high praise from students and colleagues.
“The hardest part is that it takes a lot of time,” says Rolla, “at least three times as much work as a traditional lecture, and that’s once you’re familiar with the tools.” He estimates that since February, he’s been spending 35 hours weekly preparing his online teaching content.

https://www.nature.com/articles/d41586-020-00896-7




Tyranny as an outcome of democracy?


02ap20 26mar2020 13nov2019
It was a democracy without constraint against the worst impulses of the majority.
 Demagogues’ manipulation of the Athenian people left a legacy of
instability,
bloodshed and
genocidal warfare,
described in Thucydides’ history.
Misleading speech is the essential element of despots, because despots need the support of the people.

That record is why Socrates – before being sentenced to death by democratic vote – chastised the Athenian democracy for its elevation of
             popular opinion
at the expense of truth.
Greece’s bloody history is also why Plato
associated democracy with tyranny

Basic liberal assumptions to remember

02apr20 26mar20 07dez2018
"Much of America still lives in the dark ages,
bound to their conspiracies,
unable to account for basic liberal assumptions:
     women are equal citizens,
     science is real,
    doctors aren’t trying to kill you,
    the news isn’t always lying,
    races can co-exist,
    school is important,
    government can do more good than bad,
     etc." 

Filmes Indicados por Tema

Autismo
Uma viagem inesperada (Filme) 
The good doctor (Série)

daily meditation could slow brain aging

02/04/20 26-23mar2020
Study suggests daily meditation slows brain aging by Bob Yirka , Medical Xpress

Researchers scanned [Budhist Monk] Yongey Mingyur Rinpoche's brain
via an MRI machine four times over the past 14 years.
Over the same period, the researchers also obtained MRI brain scans of a  consisting of 105 other adults from the local area who were near in age to Yongey Mingyur Rinpoche.

The researchers then submitted all of the brain scans to an AI system called the Brain Age Gap Estimation (BrainAge) framework. It had been taught to make

educated guesses of a person's age by looking at brain scans.
It does its work by noting the structure of gray matter in the brain, which lessens in mass as a person ages.
The BrainAge system estimated Yongey Mingyur Rinpoche's age to be 33 [while he actual age was 41];
others in the control group fell into what the team described as the "typical aging band."

The researchers interpreted this result as evidence of his brain aging at a slower rate than the control group.
The researchers note that the BrainAge system did find some parts of Yongey Mingyur Rinpoche's brain that had aged in ways similar to the control group, suggesting that
brain aging differences between individuals may be due to coordinated changes throughout a person's gray matter.
They also noted that they had found evidence showing that Yongey Mingyur Rinpoche's brain
     had matured earlier
     than the brains of the others in the control group.

>8000 step a day could lower risk of early death, study finds

02apr20 26-24mar2020 

compared with taking 4,000 steps per day,
taking 8,000 steps per day was associated with about a 50% lower risk of death and
taking 12,000 steps per day was associated with a 65% lower risk of death.
By contrast the team found no link between
     mortality and the intensity of steps
     – explored by looking at steps per minute – once the total number of steps taken was considered.
step monitoring in more than 4,800 adults aged 40 or over has shown that higher step counts are associated with a lower chance of death from any cause over a 10-year period. What is more, it seems individuals do not need to hit 10,000 steps a day to start seeing a benefit.

By contrast, taking 2,000 steps per day was linked to a 50% greater risk of death than hitting 4,000 steps per day, with 21.7 deaths per 1,000 adults per year compared with 14.4 deaths per 1,000 adults per year respectively.
Further analysing showed higher step counts were also associated with a lower risk of death from
cardiovascular disease and
cancer.
However, the study has limitations, including that
it cannot prove that the increased walking is the cause of a reduced risk of death, while
participants’ data on their health and lifestyle
was only collected at one point in time and by self-report,
and activity was only monitored over one week.

Speech recognition racial bias


02apr20 26-24mar2020

On average, the systems misunderstood
     35 percent of the words spoken by blacks but only
     19 percent of those spoken by whites.

Automated speech recognition less accurate for blacks: study

All five speech recognition technologies had error rates that were almost twice as high for blacks as for whites—even

when the speakers were matched by gender and age and
when they spoke the same words.

Error rates were highest for African American men, and the disparity was higher among speakers who made heavier use of African American Vernacular English.

Hidden bias
The researchers speculate that the disparities common to all five technologies stem from a common flaw—the machine learning systems used to train speech recognition systems likely rely heavily on databases of English as spoken by white Americans. A more equitable approach would be to
include databases that reflect a greater diversity of the accents and dialects of other English speakers.
While the study focused exclusively on disparities between black and white Americans, similar problems could affect people who speak with
  • regional and
  • non-native-English accents,
the researchers concluded.
If not addressed, this translational imbalance could have serious consequences for people's careers and even lives.
  • Many companies now screen job applicants with automated online interviews that employ .
  • Courts use the technology to help transcribe hearings.
  • For people who can't use their hands, moreover, speech recognition is crucial for accessing computers.

Coronavirus: what engineers could do?

02apr2020  26mar2020
... put a virologist, a social scientist and an engineer in the same room (or videoconference), and new ideas to delay transmission and safely allow wider elements of day-to-day life continue could emerge.
No country, has managed to deploy engineering solutions in a way that also helps day-to-day life continue in some safe way (in coronatimes). 

When you look at the potential that engineering can bring to this in
  • a public health (preventive) rather than
  • a medical (restorative) setting,
it shows how much we're actually missing.
SAGE for coronavirus comprises two groups,
one which draws on the epidemiology of historic pandemic flu,
and one that focuses on the social science of public health. These groups feature experts across medicine, epidemiology and social sciences only.

But engineers? Not likely, it seems. There are no dams here to fix … or are there? Clearly the infection needs to be contained, and allowed to trickle out in a controlled flow in order for the whole system to be managed safely into a less critical state.
That sounds like an engineering challenge to me.
When we look at which countries have done relatively well in tackling the virus, there are signs of (computer) engineering at work. In South Korea it is reported that an app—Corona 100m—helped mobilise crowdsourced information on infections, both possible and actual. In China, part of the "effectiveness" in containing the deaths from the virus is reportedly due to the rapid construction of new hospitals. No country, however, has managed to deploy engineering solutions in a way that also helps day-to-day life continue in some safe way.
Ultimately, we need to design creative, workable and effective responses that better balance protection from the virus with disruption to daily life. Instead, we have scientists with fantastically  about the biology and epidemiology of viruses, and maybe about the cognitive tricks that lean us towards doing one action over another.

What engineers could do
Let's pause for a moment and think about what could have been done to help slow the spread of COVID-19, without also shutting down the whole of society, with potentially huge, long-term economic and social consequences.
If virologists can give some insight into the main sources of transmission, could engineers design specific, deployable responses to that?
I'm not an engineer or a virologist, but I study how science, technology and engineering can be used in policy to change the world for the better. So while I don't have the answers, I can start the ball rolling.
What about focusing on the mass production and distribution of on-street hand sanitizer, or gloves treated with new, safe anti-viral coatings?
There may also be new ways of opening doors without grabbing the handle, or indeed pressing lift buttons.
Could we design better protective infrastructure for shop workers facing customers at tills?
What about bring-your-own trolley handles?
Or new kinds of easy-to-make and deploy protective face gear for the elderly and vulnerable?
Engineering solutions would have been especially effective early on during the outbreak, before measures like lockdown were introduced. But even during lockdown, they could help minimize the spread of the virus in the parts of society that are still open, such as banks and supermarkets.
Sat here on my own, I can't solve the problem, but put a virologist, a social scientist and an engineer in the same room (or videoconference), and new ideas to delay transmission and safely allow wider elements of day-to-day life continue could emerge.
When you look at the potential that engineering can bring to this in
  • a public health (preventive) rather than
  • a medical (restorative) setting,
it shows how much we're actually missing. It may be that these particular (disinfectant) solutions are not workable at scale, but the point is that engineers could probably come up with other design solutions that would work. It's their job.

The problem is, often social scientists just don't speak to or mix with engineers very much. It's a deep-rooted problem, like two parts of a family that fell out years ago over some obscure argument that nobody remembers, but everyone repeats.
I work at the Science, Technology, Engineering and Public Policy department at University College London. We see it as part of our mission to bring scientists and engineers together so everyone can benefit. The  case study shows now more than ever how much we need that kind of collaboration.

Inequality Regimes

02ap2020 26mar20
“Thomas Piketty Takes On the Ideology of Inequality”
‘Every human society must justify its inequalities,’ the book begins. 

What follows is a comprehensive investigation of how different societies have done precisely that, 
ranging through what the book terms various ‘inequality regimes.'”

The tendency in economics now—as well as in a great deal of public discussion—is to
view the economy as a natural force,
existing independently from our ideas about what it is and how it ought to work.

This book systematically demolishes that self-serving conceit by charting in extensive detail

how differently it has operated at different periods of time, and
how its operation is conditioned by the ideologies with which it co-develops.

‘The market and competition,
profits and wages,
capital and debt,
skilled and unskilled workers,
natives and aliens,
tax havens and competitiveness—
none of these things exist as such,’ Piketty insists.

‘All are social and historical constructs’ that ‘depend entirely’ on the ‘systems that people choose to adopt and the conceptual definitions they choose to work with.’…

An exhaustive assessment of Capital and Ideology would require more space and expertise than I have, but the basic contours of the book are easy enough to describe.
“Thomas Piketty Takes On the Ideology of Inequality” [Marshall Steinbaum, Boston Review].

Leituras pendentes 01apr2020


domingo, 29 de março de 2020

Desemprego estimulado

29/03/2020
24/08/2018

Inverter a espiral de desinvestimento e de desemprego avassalador: é necessário lembrar todo dia que esse desemprego foi programado.

Isso, ainda mais, depois de péssimas notícias, na área de economia, em relação ao desemprego recorde de:
- + de 11 milhões de desempregados;
- sobretudo chef@s de família;jovens;
Situação que só deve se agravar com a expansão da pandemia do Coronavirus.

Já dizia Manu d'Ávila, em 2018

''as medidas anticrise do desgoverno Temer exterminaram com o mercado de trabalho".

Eu digo, mais especificamente, que  "exterminam os trabalhadores e outros precarizados".

Já que os trabalhadores estão cada vez mais:
desalentados de procurar trabalhos.

E aqueles poucos que conseguem serviço,  encontram condições cada vez mais precarizadas com, entre outros aspectos:
- o avanço do trabalho informal;
-  a terceirização irrestrita, inclusive de atividades fins.
- uberização;

O "precariado" ( conceito de Jessé de Souza) precisa estar consciente de que seu  extermínio e degradação são  programados.

Nessa conjuntura devastadora de mais de 11% de desempregados no Brasil, como não me lembrar de que até  2013, o Brasil vivia com desemprego, pelo menos oficial, de menos de 5%.

Lembro-me ainda mais de economistas neoliberais decretarem todo dia  a necessidade de:

- aumentar o desemprego para diminuir o custo da mão de obra.

Você se lembra disso?

comente por favor:
o que pode ser feito para mudar essa desgraça?