Women outperform men on math tests (only if the teacher knows he is evaluating a woman)

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Las mujeres superan a los hombres en exámenes de matemáticas (solo si el profesor sabe que evalúa a una mujer)

In this recent study, women outperform men in reading/writing whether the tests were given blindly or not (i.e., the examiner knew the sex of the examinee or not).

However, in mathematics, men outperformed women when the exams were blind, but women to men when they did not go blindly.

Sexual bias

The study's findings suggest that examiners (secondary school teachers) may be biased in favor of women in their mathematics evaluations.

On the other hand, girls who benefit from gender bias in mathematics are more likely to select a science major in high school. Without teachers' bias in favor of girls, the gender gap when choosing a science career would be 12.5% greater in favor of boys.

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Similarly, in 2017, social researchers William von Hippel and David Buss sent a survey by email to a sample of psychologists, asking their beliefs about a variety of evolutionary statements and findings. These psychologists were more likely to endorse a sex difference in favor of women than in favor of men. Specifically, they were more likely to agree that women could have evolved to be more verbally talented than men than that men could have evolved to be more mathematically talented than women.

It is not the only observed example of bias towards the female sex. For example, another newly published study in it British Journal of Psychology directed by Steve Stewart-Williams found that people respond to research on sex differences in ways that favor women.

In the study, participants were asked to read a popular science article that was experimentally manipulated to suggest that men or women have a more desirable quality (for example, men/women are better at drawing or men/women lie less often). Participants evaluated pro-women's research more favorably than pro-men's research. Specifically, participants found pro-women's research to be more important, more plausible, and more well-conducted, and they found pro-men's research to be more offensive, more harmful, more disturbing, and inherently sexist.

This pro-female bias was observed between male and female participants.

It has also been discovered that people have a greater desire to censor science that disfavors women.

Ironically, these pro-feminine preferences may explain why dominant narratives focus so assiduously on the possibility of anti-female prejudice: Society cares more about the well-being of women than men and is therefore less tolerant of disparities that disadvantage them. A series of studies directed by Katharina Block found that people care more about female underrepresentation in careers than they care about male underrepresentation.

Perhaps this bias has something to do with the fact that men tend to be incarcerated more often than women and also receive higher sentences, or that they are shot by police is also higher, or that they are victims of violent crimes, or that are homeless, or who commit suicide or die at work.


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Women outperform men on math tests (only if the teacher knows he is evaluating a woman)

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Books that inspire us: 'The Invention of Air' by Steven Johnson

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Libros que nos inspiran: ‘La invención del aire’ de Steven Johnson

Sparkling water was invented by an English clergyman and chemist named Joseph Priestley. For that reason alone, it is worth reading this biography of the 18th century English scientist written by Steve Johnson: The invention of air.

Priestley discovered, among other things, oxygen.

Oxygen

The Priestley biography It is only the excuse to superficially touch on the fact that ideas do not flourish in geniuses, but in ecosystems, because Priestley exemplifies, as well as other scientists who revolutionized his time, that the idea of individual, excluded and special genius is a romantic idea that has little support. in the light of the history of ideas.

La invención del aire: Un descubrimiento, un genio y su tiempo (Noema)

The invention of air: A discovery, a genius and his time (Noema)

Great advances have occurred thanks to epistolary communication, to cafeterias where groups of interdisciplinary intellectuals met, to institutions that forced their members to communicate with each other. And all of this has been multiplied by a million thanks to the best tool for connecting people and ideas: the Internet.

Still, the excuse for Priestley's biography contains enough pages and interesting ideas to be worth reading on its own. The invention of air. How, in addition to this vital journey, We also find an outline of these revolutionary ideas about how cultural paradigm shifts work. (or mental), this work by Steven Johnson, once again, is brilliant no matter where you look at it (and it has several facets to look at, like good diamonds).

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Books that inspire us: 'The Invention of Air' by Steven Johnson

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Long-term immunity unlikely: 35 years of infection research suggests so

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La inmunidad a largo plazo es poco probable: 35 años de investigación sobre infecciones nos lo sugiere

In a new study Published in Nature Medicine, researchers have studied four species of these seasonal coronaviruses over the past 35 years and have found that reinfection occurs frequently, about a year after the first episode.

While that doesn't necessarily say anything about the current global pandemic, it is not a good sign for hopes of long-term immunity in a population.

Immunity

Analyzing 513 serum samples collected since the 1980s from 10 healthy men living in Amsterdam, the researchers noted several spikes of antibodies related to coronaviruses. Each of these spikes was interpreted as a reinfection, and for the four seasonal coronaviruses studied, including HCoV-NL63, HCoV-229E, HCoV-OC43, and HCoV-HKU1, the team found 3 to 17 infections per patient.

Some rare reinfections appeared as early as six months after the initial infection, but more commonly, they returned about a year later, 'indicating that protective immunity is short-lived.' To date, there are few confirmed cases of COVID-19 reinfection, so it is still too early to say how long acquired immunity to SARS-CoV-2 may last.

Looking at other coronaviruses is one of our best clues, and unfortunately, this 35-year study suggests that immunity for many coronavirus infections is not only temporary, it's short-lived. Besides, authors say reinfection may be a common feature of all human coronaviruses.

The blood samples, which were collected every 3 months before 1989 and every 6 months after (barring an unexplained six-year gap in the data), show that most coronavirus infections in Amsterdam occurred in winter. With the northern hemisphere now firmly in autumn, that is an extremely worrying result if the new findings are applied to the current global pandemic. A very dark winter may be awaiting us.

It remains to be seen whether SARS-CoV-2 follows the same trend as other coronaviruses. But it appears that acquiring a lasting immune response from a vaccine could be difficult. We may need to receive regular updates, as we do with the seasonal flu.


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Long-term immunity unlikely: 35 years of infection research suggests so

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Books that inspire us: 'The World Until Yesterday' by Jared Diamond

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Libros que nos inspiran: ‘El mundo hasta ayer’ de Jared Diamond

When Jared Diamond projected this book, The world until yesterdayr, he did it with a generous dose of ambition, as is usual in his previous books, such as Guns, germs and steel either Collapse.

Here Diamond, no less, addresses all aspects of human culture, of all the peoples of the world, during the last 11,000 years.

Civilizations

But what is the ultimate reason for investigating the ways of living of people of the past? Jared Diamond maintains that, although most of them will not contribute anything to us, because they have already been overcome, some solutions or ways of operating in traditional societies could perhaps be recovered to solve problems that plague us in modern societies.

To do this, Diamond has selected nine areas spread across the eleven chapters in order to illustrate how we can take advantage of our knowledge about traditional societies in different ways: the dangers and raising children, the treatment of the elderly, languages and polyglotism, healthy lifestyles, peaceful conflict resolution, and even issues that have to do with religion and spirituality. Finally, Diamond focuses two chapters on the controversial topic of war, among other things to discover that violence rates are better managed thanks to a modern State.

El mundo hasta ayer: ¿Qué podemos aprender de las sociedades tradicionales? Premio Pulitzer por Armas (Ensayo | Historia)

The world until yesterday: What can we learn from traditional societies? Pulitzer Prize for Weapons (Essay | History)

To x-ray everything previously stated, Diamond focuses on bands and tribes of small-scale farmers and hunter-gatherers, especially associated with New Guinea and other adjacent islands in the Pacific, which are the ones the author dominates, and because New Guinea offers great cultural diversity: it is the exclusive home of 1,000 of the approximately 7,000 languages that exist in the world, and It also houses the largest number of companies that, even today, remain outside the control of state governments.

Thus, guided by Diamond's erudite prose, we will discover how the Dani, the Fayu, the Daribi, the Enga, the Fore, the Hinihon, the Kaulong live, but also Australian tribes such as the Yolngu, the Kunai or the Wiil, to Eurasian tribes such as the Agta, the Aino and the Nganasan, and African tribes such as the Hadza, the Ikung or the Turkana.

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The world until yesterday, then, is monumental, both in number of pages and in topics covered, although issues such as art, cognition, cooperative behavior, gender relations, marriage or sexual practices are missed (perhaps for a second delivery?). And, in addition, a greater development of the chapter dedicated to linguistics and, above all, to the analysis of the progressive decline in the diversity of languages, which has long seemed to me to be the weakest in the volume.


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This new packaging extends its conservation between 2.5 and 8 times compared to conventional conservation plastic.

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Este nuevo envoltorio prolonga su conservación entre 2,5 y 8 veces sobre el plástico de conservación convencional

Made from a blend of two safe components that forms a thin film that is tasteless, colorless and odorless, completely biodegradable and non-toxic, this new biodegradable antibacterial wrap further protects food, between 2.5 and 8 times that of conventional conservation plastic, and has been developed by chemists from RUDN University.

Chemists at RUDN University developed the antibacterial films based on chitosan, a polysaccharide obtained from the shells of crabs or lower fungi.

Biodegradable antibacterial wrap

To check the properties of the substance, lChemists from RUDN University covered bananas with plastic film for 10 days. The fruits that were under the plastic film lost 3 times less weight and 8 times less vitamin C than those that were without it. Furthermore, after use, the film will degrade without causing harm to the environment.

The new film is produced from natural macromolecules, that is, polysaccharides, which are the "building material" of living organisms. Two substances derived from chitosan were used: the sodium salt of succinyl chitosan (SC-Na) and a triazole, betaine and chitosan compound (TBQ), which has antibacterial properties comparable to those of modern antibiotics.

As explained Andrey Kiritchenko, assistant of the Department of Inorganic Chemistry of RUDN University:

We have obtained non-toxic chitosan derivatives with exceptional antibacterial activity similar to that of commercial antibiotics, and for this reason we hypothesized that the film resistance and antibacterial activity would increase significantly. As a base, we decided to use SC-Na salt, which has a high film-forming capacity. In addition, it is non-toxic and acts as an antioxidant, which is important to prolong the shelf life of perishable foods. By changing the TBC:SC-Na ratio, we have developed multifunctional plastic films with improved antibacterial, barrier and mechanical properties.


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Books that inspire us: 'Curiosity: Why everything interests us' by Philip Ball

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Libros que nos inspiran: 'Curiosidad: Por qué todo nos interesa’ de Philip Ball

Epistemic longing or, more prosaically, curiosity to know is what one of the latest books by the prolific author is about. Philip Ball. About why we are curious, about why we are interested in, potentially, everything. The title under which Ball has collected his thick essay could not be any other: Curiosity.

Episteme

In Curiosity, Ball also covers the milestones of astronomers, chemists or physicists who, in a world where curiosity was frowned upon in the wake of the original sin committed by the biblical Eve, chose to remove the shadows, ask the why of things, replace the magic and sophistry by evidence.

Curiosidad. Por qué todo nos interesa (Noema)

Curiosity. Why everything interests us (Noema)

They were heroes because some pioneers in the Middle Ages paid, sometimes with their lives, for an excess of curiosity.. For example, the story of Kepler, who by persevering revealed the structure of the movements of the planets, moving the Earth away from the center of the Universe. Or the odyssey of Galileo, who confronted the Church after seeing with his own eyes, thanks to a modest telescope, what the Moon and some planets were like.

The life of Robert Hooke will reveal to us how a person with hardly any resources can become a relevant person in science, using their innate curiosity as the only driving force.

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Ball describes in detail the shine in the eyes of these characters, and he does it with closeness and rigor. Not in vain, Ball belongs to this lineage of men: he is a chemist and a doctor in Physics from the University of Bristol. Editor of Nature magazine, he regularly contributes to New Scientist and other scientific publications. He is also a member of the Chemistry department at University College London.


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Books that inspire us: 'Anatomies' by Hugh Aldersey-Williams

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Libros que nos inspiran: ‘Anatomías’ de Hugh Aldersey-Williams

We had already been pleasantly surprised by reading The periodic table, of Hugh Aldersey-Williams, that we reviewed here a while ago, and which became one of the best chemistry popular books we had read, so now it was time to dive into another book by the same author, Anatomies, dedicated to the human body and each of its most intimate parts.

Definitely, Hugh Aldersey-Williams is one of the writers who best manages the marriage between science and literature, like a contemporary, totally alphanumeric Renaissance man.

The human body

As if he were one of the characters from the 1966 movie amazing trip, the author seems to miniaturize himself to travel inside a man's body with the purpose of revealing each of the details. Also reflecting how science has been advancing, taking possession of those newly discovered lands, dividing them into parts, proclaiming sovereignty over them in the name of new specialized disciplines.

And all of this intersected with the influence that each of those parts of the body has produced in art, literature, society, prejudices, politics, everything. Just because, The resolution of the human eye is approximately two tenths of a millimeter, which is approximately the diameter of the point that ends this sentence. But the eye was also one of the academic obsessions of the French philosopher Rene Descartes, of which we all know its Cogito ergo sum, but few know that he also wrote an essay titled The Diopter (The dioptric).

An x-ray that has been taken under the Renaissance prism on 650 muscles and 206 bones, 3 million hairs, 200,000 kilometers of veins, 440,000 million cells, a heart that beats 75 times per minute. 4,500 times per hour. 108,000 times a day. 2.8 billion times in a lifetime.

Anatomías: El cuerpo humano, sus partes y las historias que cuentan (Ariel)

Anatomies: The human body, its parts and the stories they tell (Ariel)

That's how immense, and much more, the human body is. And thanks to the compass-like pen of Aldersey-Williams, We will know how to orient ourselves better than ever in this new geography..


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NASA calls on astronomy fans to find exoplanets

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La NASA convoca a los aficionados a la astronomía para encontrar exoplanetas

Through a recently launched website called Planet Patrol, NASA calls on astronomy fans to find exoplanets.

The objective is to review a collection of images marked with stars compiled by the Transiting exoplanet reconnaissance satellite (TESS) from NASA.

TESS

While computers are effective at studying these data sets, they are far from perfect. Even the most carefully crafted algorithms can fail when a planet's signal is weak. And that's where the competition of the human mind comes in..

The volunteers of Planet Patrol They will help discover such worlds and help scientists understand how planetary systems form and evolve throughout the universe.

To do this, volunteers They must answer a set of questions for each of the images, such as whether it contains multiple bright sources or whether it resembles stray light, rather than starlight.


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This spectacular 'time-lapse' of a supernova exists thanks to Hubble

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Este espectacular 'time-lapse' de una supernova existe gracias al Hubble

Located 70 million light years away, images from the Hubble telescope have been gathered in a starburst movie that disappears in the spiral galaxy NGC 2525. Specifically, supernova SN 2018gv.

Hubble astronomers were using the supernova as part of a program to precisely measure the expansion rate of the universe.

SN 2018gv

Over the past 30 years, Hubble has helped dramatically improve the accuracy of the universe's expansion rate, and can also provide us with spectacular images.

The time-lapse that you can see below covers almost a year. According to the Nobel Prize Adam Riess from the Space Telescope Science Institute (STScI) and Johns Hopkins University, Baltimore, Maryland:

No terrestrial fireworks display can compete with this supernova, captured in its faded glory by the Hubble Space Telescope.

The type of supernova seen in this sequence originated from a consumed star, a white dwarf located in a nearby binary system.


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This spectacular 'time-lapse' of a supernova exists thanks to Hubble

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