Hà Nội và Nam Định đang vào những ngày nhiều mây và mưa trong nhiều ngày qua.
Blog này thảo luận và chia sẻ những tri thức về khoa học khí quyển và các khoa học khác. "Mọi thứ chúng ta làm đều phải dựa vào nghiên cứu KHOA HỌC chất lượng cao nhất". Thien V. Le
Chủ Nhật, 26 tháng 9, 2021
Hanoi và Nam Định chuẩn bị đón thời tiết lý tưởng: KHÔNG mưa, quang mây trong xanh và NẮNG. Vì sao?
Chủ Nhật, 12 tháng 9, 2021
Một loại vitamin rẻ, an toàn và luôn luôn có sẵn có thể loại bỏ hơn 60% nguy cơ tử vong và giảm > 50% nguy cơ viêm phổi cấp
Chúng ta suốt ngày được nghe về vắc xin, về ca dương tính và gieo nỗi sợ hãi từ các phương tiện thông tin. Nhưng rất tiếc có một thứ mà không có phương tiện thông tin nào đưa tin đó chính là vai trò của Vitamin D.
Đây là bài viết mới toàn diện đầy đủ tổng quan về 24 kết quả nghiên cứu quan sát được với 3637 người tham gia. Họ nhận ra rằng với người mà tổng 25-OH Vit D3 <30 ng/mL có hơn 60% nguy cơ tử vong và hơn 50% nguy cơ phát triển viêm phổi cấp so với người mà có 25-OH >30 ng/mL. Bệnh nhân bị Covid-19 mà có lượng vitamin D thấp cũng có mức độ chỉ số viêm nhiễm cao hơn (Hs-CRP, IL-6 và D-dimer).
Các nghiên cứu trước đây về vai trò của Vitamin D và covid-19 ở đây (https://thienminhle.blogspot.com/2021/08/khoa-hoc-noi-gi-ve-vai-tro-cua-vitamin.html)
Thiếu hụt Vitamin D cũng liên quan mạnh với bện tiểu đường, tim mạch, ung thư, mất trí, và tử vong sớm...
Rất tiếc không có phương tiện thông tin đại chúng nào đưa tin nhiên cứu như này. Tại sao nó không được đưa tin lên trang nhất của các thông tin báo? Tại sao các quan chức sức khỏe cộng đồng của chúng ta không đưa tin như này cho thế giới?
Hãy thúc giục anh em và bạn bè trong gia đình bạn tối ưu hàm lượng vitamin D và chia sẻ thông tin này đến các bác sĩ và những người chăm sóc y tế cộng đồng và yêu cầu họ hãy xét nghiệm hàm lượng Vitamin D càng sớm càng tốt và có kế hoạch hành động để tối ưu hàm lượng Vitamin D.
Results
Twenty-four observational studies containing 3637 participants were included in the meta-analysis. The mean age of the patients was 61.1 years old; 56% were male. Low vitamin D status was statistically associated with higher risk of death (RR, 1.60 (95% CI, 1.10–2.32), higher risk of developing severe COVID-19 pneumonia (RR: 1.50; 95% CI, 1.10–2.05). COVID-19 patients with low vitamin D levels had a greater prevalence of hypertension and cardiovascular diseases, abnormally high serum troponin and peak D-dimer levels, as well as elevated interleukin-6 and C-reactive protein than those with serum 25(OH)D levels ≥30 ng/ml.
Conclusions
In this meta-analysis, we found a potential increased risk of developing severe COVID-19 infection among patients with low vitamin D levels. There are plausible biological mechanisms supporting the role of vitamin D in COVID-19 severity. Randomized controlled trials are needed to test for potential beneficial effects of vitamin D in COVID-19 outcomes.
https://www.tandfonline.com/doi/full/10.1080/07315724.2021.1951891
Thứ Hai, 6 tháng 9, 2021
Hôm nay nắng to nhưng ngày mai lại mây và mưa rào. Vì sao?
Hanoi và miền Bắc đã bước vào tiết trời mùa thu. Một trong những dấu hiệu để biết là hãy nhìn lá cây rụng dần.
Thời gian đầu mùa thu Hanoi cũng thường xuyên có những cơn mưa giông xảy ra. Vì sao? Do sự giảm nhanh của nhiệt độ làm cho không khí không thể giữ được hơi nước. Phân tích tổ hợp các kết quả của nhiều mô hình (phương pháp tốt nhất để giảm sai số) cho thấy một khối không khí mát lạnh hơn từ phía Bắc ở Trung Quốc sẽ tràn xuống miền Bắc vào đêm và rạng sáng mai (7/9). Hệ quả là:Trong rạng sáng ngày mai Hanoi sẽ bắt đầu chứng kiến mưa rào và giông xảy ra. Khác hoàn toàn với hôm nay, trong ngày mai Hanoi có mưa và mây nhiều hơn và hầu như không có nắng.
Nam Định thì sao? Mưa sẽ xảy ra ở Nam Định muộn hơn có thể bắt đầu vào sáng mai.
Trong cả tuần này thì mưa rào rải rác và nhiều mây xảy ra vào sáng thứ 4 (ngày kia 8/9). Từ thứ 5-thứ 7 thì trời NẮNG trở lại. Ngày CN tuần này lại có mưa và mây.
Thứ Bảy, 4 tháng 9, 2021
Effects of Fruit and Vegetable-Based Nutraceutical on Cognitive Function in a Healthy Population: Placebo-Controlled, Double-Blind, and Randomized Clinical Trial
Abstract
There is scientific evidence of the positive effect of polyphenols from plant foods on cognition, but not enough is known about the synergistic effect when multiple polyphenols are consumed and even less in a healthy non-elderly population. The aim of the present study is to investigate the possible effects of improvements in cognitive function in healthy people as a preparation based on micronized fruit and vegetables consumed. One hundred and eight subjects were selected, stratified by sex in the control intervention group (n = 53) and placebo (n = 55). Volunteers completed the study after two 16-week periods of consumption with a 4-week wash period between each phase. At the beginning and the end of each phase, volunteers performed the Stroop, TESEN, and RIST tests for the measurement of different cognitive function patterns. The results revealed statistically significant differences in all the variables of the tests carried out, especially compared with the placebo. Specially, the results obtained in the Stroop and TESEN test, in addition to the processing speed even with semantic interferences, were markedly better after the treatment with the product under study. Moreover, the consumption of the product under study clearly improves short-term memory, verbal and non-verbal, according to the results obtained in the RIST test. The results showed an improvement in executive function in terms of short-term memory, working memory, selective and sustained attention, and speed of processing.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7830952/?fbclid=IwAR3sGHO4bHNGshXTNWd2tu_DiScllRuH2GDA1Og1Bj7pg-yA7ljrRGqY-Fw
Thứ Sáu, 3 tháng 9, 2021
The Death Of Expertise
I am (or at least think I am) an expert. Not on everything, but in a particular area of human knowledge, specifically social science and public policy. When I say something on those subjects, I expect that my opinion holds more weight than that of most other people.
I never thought those were particularly controversial statements. As it turns out, they’re plenty controversial. Today, any assertion of expertise produces an explosion of anger from certain quarters of the American public, who immediately complain that such claims are nothing more than fallacious “appeals to authority,” sure signs of dreadful “elitism,” and an obvious effort to use credentials to stifle the dialogue required by a “real” democracy.
But democracy, as I wrote in an essay about C.S. Lewis and the Snowden affair, denotes a system of government, not an actual state of equality. It means that we enjoy equal rights versus the government, and in relation to each other. Having equal rights does not mean having equal talents, equal abilities, or equal knowledge. It assuredly does not mean that “everyone’s opinion about anything is as good as anyone else’s.” And yet, this is now enshrined as the credo of a fair number of people despite being obvious nonsense.
What’s going on here?
I fear we are witnessing the “death of expertise”: a Google-fueled, Wikipedia-based, blog-sodden collapse of any division between professionals and laymen, students and teachers, knowers and wonderers – in other words, between those of any achievement in an area and those with none at all. By this, I do not mean the death of actual expertise, the knowledge of specific things that sets some people apart from others in various areas. There will always be doctors, lawyers, engineers, and other specialists in various fields. Rather, what I fear has died is any acknowledgement of expertise as anything that should alter our thoughts or change the way we live.
This is a very bad thing. Yes, it’s true that experts can make mistakes, as disasters from thalidomide to the Challenger explosion tragically remind us. But mostly, experts have a pretty good batting average compared to laymen: doctors, whatever their errors, seem to do better with most illnesses than faith healers or your Aunt Ginny and her special chicken gut poultice. To reject the notion of expertise, and to replace it with a sanctimonious insistence that every person has a right to his or her own opinion, is silly.
Worse, it’s dangerous. The death of expertise is a rejection not only of knowledge, but of the ways in which we gain knowledge and learn about things. Fundamentally, it’s a rejection of science and rationality, which are the foundations of Western civilization itself. Yes, I said “Western civilization”: that paternalistic, racist, ethnocentric approach to knowledge that created the nuclear bomb, the Edsel, and New Coke, but which also keeps diabetics alive, lands mammoth airliners in the dark, and writes documents like the Charter of the United Nations.
This isn’t just about politics, which would be bad enough. No, it’s worse than that: the perverse effect of the death of expertise is that without real experts, everyone is an expert on everything. To take but one horrifying example, we live today in an advanced post-industrial country that is now fighting a resurgence of whooping cough — a scourge nearly eliminated a century ago — merely because otherwise intelligent people have been second-guessing their doctors and refusing to vaccinate their kids after reading stuff written by people who know exactly zip about medicine. (Yes, I mean people like Jenny McCarthy.
In politics, too, the problem has reached ridiculous proportions. People in political debates no longer distinguish the phrase “you’re wrong” from the phrase “you’re stupid.” To disagree is to insult. To correct another is to be a hater. And to refuse to acknowledge alternative views, no matter how fantastic or inane, is to be closed-minded.
How conversation became exhausting
Critics might dismiss all this by saying that everyone has a right to participate in the public sphere. That’s true. But every discussion must take place within limits and above a certain baseline of competence. And competence is sorely lacking in the public arena. People with strong views on going to war in other countries can barely find their own nation on a map; people who want to punish Congress for this or that law can’t name their own member of the House.
None of this ignorance stops people from arguing as though they are research scientists. Tackle a complex policy issue with a layman today, and you will get snippy and sophistic demands to show ever increasing amounts of “proof” or “evidence” for your case, even though the ordinary interlocutor in such debates isn’t really equipped to decide what constitutes “evidence” or to know it when it’s presented. The use of evidence is a specialized form of knowledge that takes a long time to learn, which is why articles and books are subjected to “peer review” and not to “everyone review,” but don’t tell that to someone hectoring you about the how things really work in Moscow or Beijing or Washington.
This subverts any real hope of a conversation, because it is simply exhausting — at least speaking from my perspective as the policy expert in most of these discussions — to have to start from the very beginning of every argument and establish the merest baseline of knowledge, and then constantly to have to negotiate the rules of logical argument. (Most people I encounter, for example, have no idea what a non-sequitur is, or when they’re using one; nor do they understand the difference between generalizations and stereotypes.) Most people are already huffy and offended before ever encountering the substance of the issue at hand.
Once upon a time — way back in the Dark Ages before the 2000s — people seemed to understand, in a general way, the difference between experts and laymen. There was a clear demarcation in political food fights, as objections and dissent among experts came from their peers — that is, from people equipped with similar knowledge. The public, largely, were spectators.
This was both good and bad. While it strained out the kook factor in discussions (editors controlled their letters pages, which today would be called “moderating”), it also meant that sometimes public policy debate was too esoteric, conducted less for public enlightenment and more as just so much dueling jargon between experts.
No one — not me, anyway — wants to return to those days. I like the 21st century, and I like the democratization of knowledge and the wider circle of public participation. That greater participation, however, is endangered by the utterly illogical insistence that every opinion should have equal weight, because people like me, sooner or later, are forced to tune out people who insist that we’re all starting from intellectual scratch. (Spoiler: We’re not.) And if that happens, experts will go back to only talking to each other. And that’s bad for democracy.
The downside of no gatekeepers
How did this peevishness about expertise come about, and how can it have gotten so immensely foolish?
Some of it is purely due to the globalization of communication. There are no longer any gatekeepers: the journals and op-ed pages that were once strictly edited have been drowned under the weight of self-publishable blogs. There was once a time when participation in public debate, even in the pages of the local newspaper, required submission of a letter or an article, and that submission had to be written intelligently, pass editorial review, and stand with the author’s name attached. Even then, it was a big deal to get a letter in a major newspaper.
Now, anyone can bum rush the comments section of any major publication. Sometimes, that results in a free-for-all that spurs better thinking. Most of the time, however, it means that anyone can post anything they want, under any anonymous cover, and never have to defend their views or get called out for being wrong.
Another reason for the collapse of expertise lies not with the global commons but with the increasingly partisan nature of U.S. political campaigns. There was once a time when presidents would win elections and then scour universities and think-tanks for a brain trust; that’s how Henry Kissinger, Samuel Huntington, Zbigniew Brzezinski and others ended up in government service while moving between places like Harvard and Columbia.
Those days are gone. To be sure, some of the blame rests with the increasing irrelevance of overly narrow research in the social sciences. But it is also because the primary requisite of seniority in the policy world is too often an answer to the question: “What did you do during the campaign?” This is the code of the samurai, not the intellectual, and it privileges the campaign loyalist over the expert.
I have a hard time, for example, imagining that I would be called to Washington today in the way I was back in 1990, when the senior Senator from Pennsylvania asked a former U.S. Ambassador to the UN who she might recommend to advise him on foreign affairs, and she gave him my name. Despite the fact that I had no connection to Pennsylvania and had never worked on his campaigns, he called me at the campus where I was teaching, and later invited me to join his personal staff.
Universities, without doubt, have to own some of this mess. The idea of telling students that professors run the show and know better than they do strikes many students as something like uppity lip from the help, and so many profs don’t do it. (One of the greatest teachers I ever had, James Schall, once wrote many years ago that “students have obligations to teachers,” including “trust, docility, effort, and thinking,” an assertion that would produce howls of outrage from the entitled generations roaming campuses today.) As a result, many academic departments are boutiques, in which the professors are expected to be something like intellectual valets. This produces nothing but a delusion of intellectual adequacy in children who should be instructed, not catered to.
The confidence of the dumb
There’s also that immutable problem known as “human nature.” It has a name now: it’s called the Dunning-Kruger effect, which says, in sum, that the dumber you are, the more confident you are that you’re not actually dumb. And when you get invested in being aggressively dumb…well, the last thing you want to encounter are experts who disagree with you, and so you dismiss them in order to maintain your unreasonably high opinion of yourself. (There’s a lot of that loose on social media, especially.)
All of these are symptoms of the same disease: a manic reinterpretation of “democracy” in which everyone must have their say, and no one must be “disrespected.” (The verb to disrespect is one of the most obnoxious and insidious innovations in our language in years, because it really means “to fail to pay me the impossibly high requirement of respect I demand.”) This yearning for respect and equality, even—perhaps especially—if unearned, is so intense that it brooks no disagreement. It represents the full flowering of a therapeutic culture where self-esteem, not achievement, is the ultimate human value, and it’s making us all dumber by the day.
Thus, at least some of the people who reject expertise are not really, as they often claim, showing their independence of thought. They are instead rejecting anything that might stir a gnawing insecurity that their own opinion might not be worth all that much.
Experts: the servants, not masters, of a democracy
So what can we do? Not much, sadly, since this is a cultural and generational issue that will take a long time come right, if it ever does. Personally, I don’t think technocrats and intellectuals should rule the world: we had quite enough of that in the late 20th century, thank you, and it should be clear now that intellectualism makes for lousy policy without some sort of political common sense. Indeed, in an ideal world, experts are the servants, not the masters, of a democracy.
But when citizens forgo their basic obligation to learn enough to actually govern themselves, and instead remain stubbornly imprisoned by their fragile egos and caged by their own sense of entitlement, experts will end up running things by default. That’s a terrible outcome for everyone.
Expertise is necessary, and it’s not going away. Unless we return it to a healthy role in public policy, we’re going to have stupider and less productive arguments every day. So here, presented without modesty or political sensitivity, are some things to think about when engaging with experts in their area of specialization.
- We can all stipulate: the expert isn’t always right.
- But an expert is far more likely to be right than you are. On a question of factual interpretation or evaluation, it shouldn’t engender insecurity or anxiety to think that an expert’s view is likely to be better-informed than yours. (Because, likely, it is.)
- Experts come in many flavors. Education enables it, but practitioners in a field acquire expertise through experience; usually the combination of the two is the mark of a true expert in a field. But if you have neither education nor experience, you might want to consider exactly what it is you’re bringing to the argument.
- In any discussion, you have a positive obligation to learn at least enough to make the conversation possible. The University of Google doesn’t count. Remember: having a strong opinion about something isn’t the same as knowing something.
- And yes, your political opinions have value. Of course they do: you’re a member of a democracy and what you want is as important as what any other voter wants. As a layman, however, your political analysis, has far less value, and probably isn’t — indeed, almost certainly isn’t — as good as you think it is.
And how do I know all this? Just who do I think I am?
Well, of course: I’m an expert.
Tom Nichols is a professor of national security affairs at the U.S. Naval War College and an adjunct at the Harvard Extension School. He claims expertise in a lot of things, but his most recent book is No Use: Nuclear Weapons and U.S. National Security (Penn, 2014). The views expressed are entirely his own.
Thứ Năm, 2 tháng 9, 2021
Hanoi và Nam Định: Hôm nay có mưa rào nhẹ rải rác, nhưng từ ngày mai và cuối tuần này lại khác. Vì sao?
Hanoi mấy hôm nay liên tục có mưa rào nhẹ rải rác vài nơi nhưng KHÔNG có giông mạnh. Sáng nay mưa rào đã xảy ra một số nơi chủ yếu ở ven biển như Nam Định
Câu hỏi là vì sao một số ngày qua mưa rào rải rác lại xảy ra ở Hanoi trong ngày? Đó là hình thế sống áp cao nóng trên cao và áp cao lạnh ở dưới làm cho sự phân tầng của khí quyển có sự khác nhau nhanh giữa nhiệt độ ở bề mặt và lên trên cao. Đó cũng là lý do mà vì sao chỉ có mưa rào nhẹ mà không có giông mạnh.Từ ngày mai đến cuối tuần này (3-5/9) thì Hanoi và cả Nam Định sẽ lại khác. Mây và mưa không còn nữa trời có nhiều NẮNG ngay từ sáng sớm. Chiều tối gió sẽ thổi mạnh hơn so với những ngày qua.
NẮNG nhiều vào sáng sớm là điều mình thích nhất để được ra ngoài quét sân phơi nắng và nghe chim hót.
Enjoy ít nhất trong 4 ngày nữa.
Thứ Tư, 1 tháng 9, 2021
RCT cho biết nhịn đói không có ý nghĩa gì trong giảm cân
Tuy nhiên, một nghiên cứu mới RCT
(phương pháp vàng chuẩn nhất trong y học) cho biết nhịn đói không mang lại gì.
Nghiên cứu này cho biết nhịn đói cách ngày làm mất ít chất béo hơn cách giảm lượng
calo hằng ngày đơn giản.
https://www.science.org/doi/10.1126/scitranslmed.abd8034





