قال الله تعالى

 {  إِنَّ اللَّــهَ لا يُغَيِّــرُ مَـا بِقَــوْمٍ حَتَّــى يُـغَيِّـــرُوا مَــا بِــأَنْــفُسِــــهِـمْ  }

سورة  الرعد  .  الآيـة   :   11

ahlaa

" ليست المشكلة أن نعلم المسلم عقيدة هو يملكها، و إنما المهم أن نرد إلي هذه العقيدة فاعليتها و قوتها الإيجابية و تأثيرها الإجتماعي و في كلمة واحدة : إن مشكلتنا ليست في أن نبرهن للمسلم علي وجود الله بقدر ما هي في أن نشعره بوجوده و نملأ به نفسه، بإعتباره مصدرا للطاقة. "
-  المفكر الجزائري المسلم الراحل الأستاذ مالك بن نبي رحمه الله  -

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لنكتب أحرفا من النور،quot لنستخرج كنوزا من المعرفة و الإبداع و العلم و الأفكار

الأديبــــة عفــــاف عنيبـــة

السيـــرة الذاتيـــةالسيـــرة الذاتيـــة

أخبـــار ونشـــاطـــاتأخبـــار ونشـــاطـــات 

اصــــدارات الكـــــاتبــةاصــــدارات الكـــــاتبــة

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science

الجمعة, 17 أيلول/سبتمبر 2021 09:57

Mystery microbes have been lurking unsuspected in most coral species

كتبه
It has long been known that coral polyps harbour algal symbionts that make most of their food. Now it has been shown that corals can also harbour microbes that appear to be parasites but don’t seem to harm their hosts. “The fact that we could go out to a coral reef, which is probably the best studied marine environment, and specifically look at the coral, which is the best studied part of that environment, and find a parasite that infects virtually every species of coral we’ve looked at, that no one had ever really noticed, blows my mind,” says Patrick Keeling at the University…
السبت, 31 تموز/يوليو 2021 10:20

How fast does Earth spin?

كتبه
To answer the question of how fast Earth spins, you need to know two things: how long it takes to make a full rotation, and Earth’s circumference. The time it takes Earth to rotate so the sun appears in the same position in the sky, known as a solar day, is 24 hours. However, the time it takes Earth to complete one full rotation on its axis with respect to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day. With this information, to work out how fast Earth is spinning we need only our…
الثلاثاء, 13 تموز/يوليو 2021 11:16

Fish are becoming addicted to methamphetamines seeping into rivers

كتبه
Illicit drug use is a growing global health concern that causes a financial burden of hundreds of billions of dollars in the US alone. But hidden beneath the societal costs of this human epidemic is a potential ecological crisis. As methamphetamine levels rise in freshwater streams, fish are increasingly becoming addicted. “Where methamphetamine users are, there is also methamphetamine pollution,” says Pavel Horký at the Czech University of Life Sciences. Humans excrete methamphetamines into wastewater, but treatment plants aren’t designed to deal with such substances. Because of this, as treated wastewater flows into streams, so do methamphetamines and other drugs. In some streams…
الثلاثاء, 06 تموز/يوليو 2021 10:22

What I Know and Don’t Know about SARS-CoV-2 Virus

كتبه
After fifteen months of assiduous reading, study, observation, and research, I have come to some conclusions about what is called COVID-19.  I would like to emphasize that I have done this work obsessively since it seemed so important.  I have consulted information and arguments across all media, corporate and alternative, academic, medical, books, etc.  I have consulted with researchers around the world. I have read the websites of the CDC, the World Health Organization, and government and non-government health organizations.  In other words, I have left no stone unturned, despite the overt or covert political leanings of the sources.  I have…
Due to unanswered questions into the origins of the coronavirus pandemic, both the U.S. government and scientists have called for a deeper examination into the validity of claims that a virus could have escaped from a lab in Wuhan, China. Much of the discussion surrounds “gain-of-function” research. So The Conversation asked David Gillum and Rebecca Moritz, who work closely with virologists on a day-to-day basis to ensure the safety and security of the research, and Sam Weiss Evans and Megan Palmer, who are science and technology policy experts, to explain what this term means and why this kind of research is important. What does gain of function mean? Any organism…
SpaceX put 60 Starlink satellites in space May 23, the first little chunk of an eventual 12,000-satellite-strong "megaconstellation" that the private company plans to place in orbit. Not long after the launch, observers and astronomers noticed something: This train of five dozen objects looked really bright overhead — unusually bright for artificial satellites. And this light show has many astronomers worried. "The Starlink satellites just passed directly overhead," Boulder, Colorado-based astronomer Alex Parker tweeted Saturday (May 25). "They were glinting, some as bright as Polaris. Quite an eerie looking thing. And yes, the stars are out." Parker, an expert in orbital mechanics, caused a stir…
الأربعاء, 09 حزيران/يونيو 2021 14:11

The rise and fall of the world’s largest lake

كتبه
When continental plates smashed together about 12 million years ago, they didn’t just raise new mountains in central Europe—they created the largest lake the world has ever known. This vast body of water—the Paratethys Sea—came to host species found nowhere else, including the world’s smallest whales. Two new studies reveal how the ancient body of water took shape and how surrounding changes helped give rise to elephants, giraffes, and other large mammals that wander the planet today. To build that timeline, paleo-oceanographer Dan Palcu of the University of São Paulo and his colleagues at the main campus assembled clues from geological…
Emerald City Systems Cash is why is the world get around, approximately they do say. Many people are in operation to generate income, however the level to that the company relates to it may differ. For instance, some businesses, like banking institutions, are created to earn money by helping others handle theirs. Banking institutions and market loan providers benefit from what’s called technology that is financial or FinTech, to more effectively offer solutions to people or businesses looking to handle, borrow, pay, see, or make use of their cash much more efficient means. Banking institutions are far more subject to…
الثلاثاء, 01 حزيران/يونيو 2021 14:15

China reports first human case of H10N3 bird flu

كتبه
BEIJING (Reuters): A 41-year-old man in China's eastern province of Jiangsu has been confirmed as the first human case of infection with the H10N3 strain of bird flu, China's National Health Commission (NHC) said on Tuesday (June 1). The man, a resident of the city of Zhenjiang, was hospitalised on April 28 after developing a fever and other symptoms, the NHC said in a statement. He was diagnosed as having the H10N3 avian influenza virus on May 28, it said, but did not give details on how the man had been infected with the virus. The man was stable and…
People learn in many different ways. Adaptive learning has sought to address differences inability by targeting teaching practices. The use of adaptive models, ranging from technological programs to intelligent systems, can be used in the traditional classroom environment. The use of these programs is expected to grow exponentially in the near future. To start, one must look at the unique needs of each student and their interests. Custom learning programs in the adaptive model create a personalized learning path for each student. Studies have shown that students are more engaged when they are able to practice frequently. Adaptive learning models also…
الأربعاء, 26 أيار 2021 09:48

Why Technology Could Slow the Clean Energy Transition

كتبه
Energy density—defined as the “amount of energy stored in a given system, substance, region of space per unit volume”—is the main reason why fossil fuels will not be replaced in the near future by renewables. Approximately 84 percent of global electricity derives from oil, natural gas, and coal. The International Energy Agency (IEA) released a sobering report on the mining and infrastructure requirements needed for decarbonization and/or net-zero to take shape. Mining to move away from hydrocarbons will require 4,200 percent more lithium, 2,500 percent more graphite, 1,900 percent more nickel, and at least 700 percent more rare earth metals and minerals.  …
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