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Image credit: Szymon Wiktorowicz, Labartory Known from 2500 years ago, many infectious diseases are seasonal, and yet for many of such diseases the underlying reasons of seasonality are not clear. With the recent outbreak of COVID‐19, the question of how the change of seasons might affect this pandemic disease became a...
TALK TALK TALK! - Model! Model the correct use of words, the use of familiar word sinew situations and in longer sentences, and the use of new words. The more that teacher model language for babies and toddlers, the more children learn. - Ask Questions! Ask different types of questions, including open-ended questions. ...
Communities of color are disproportionately exposed to harmful air particulates. A recent study by Christopher Tessum and colleagues compared the pollution-related burden experienced by White, Hispanic, and Black people in the US to the environmental pollution contributed by each group through their consumption of good...
NASA has released images of an M-class flare on the Sun taken by its Solar Dynamics Observatory. Solar flares are bursts of energy released from the surface of the Sun, in which charged particles like electrons and ions, as well as neutral atoms, are expelled. These flares are energetic enough that the particles are ab...
One of the biggest objections of the general public to nuclear power is the disposal of radioactive waste. It is widely believed that the danger from radioactive waste will be the same in tens of thousands of years in the future as it is now coming from a lack of understanding of radioisotopes decay. Nuclear power plan...
Pupils design an investigation to help them explain how and why shadows are formed and why the size and shape of a shadow can change. PoS - use the idea that light travels in straight lines to explain why shadows have the same shape as the objects that cast them, and to predict the size of shadows when the position of ...
After guzzling down the succulent pork, ancient people threw the porcine remains aside, littering the landscape with pig skulls and bones. Now, 2,800 years later, researchers have collected jaw and tooth samples from the remains of 131 of these Neolithic pigs; from the samples, they analyzed the isotopes (an element th...
A team of geologists has detected a layer in the middle of the Earth’s mantle, hitherto unknown, whose characteristics are reminiscent of those of the planet’s surface. At school they do not teach that the Earth is divided into three layers, which are the cortex, the mantle and the nucleus, which in turn is divided int...
The Articles of the American Confederation, ratified in March 1781, gave each state so much power and independence that many political leaders believed that America needed a stronger national government. They finally produced a Constitution in 1788, more then ten years after the Declaration of independence (1776), in t...
The term cerebral palsy refers to a group of neurological disorders that appear in infancy or early childhood and permanently affect body movement, muscle coordination, and balance. CP affects the part of the brain that controls muscle movements. The majority of children with cerebral palsy are born with it, although i...
Lyme disease is an illness caused by borrelia bacteria. Humans usually get Lyme disease from the bite of a tick carrying the bacteria. Ticks that can carry borrelia bacteria live throughout most of the United States. But Lyme disease is most common in the upper Midwest and the northeastern and mid-Atlantic states. It's...
A bacterium known as Bordetella pertussis causes “whooping cough”. The name refers to the whooping sound made upon breathing in during a prolonged coughing spell. This vaccine-preventable illness can be life-threatening to young children and even the elderly. In its early stages, it looks like the common cold, but then...
For many years, scientists have been studying how supernovae could affect life on Earth. Supernovae are extremely powerful events, and depending on how close they are to Earth, they could have consequences ranging from the cataclysmic to the inconsequential. But now, the scientists behind a new paper say they have spec...
Main ideas are typically found in a literary passage. Central ideas are found in an informational text. The theme is the lesson or message that the writer wants to get across in his or her story. What is the difference between theme and a moral? The difference between the theme and moral is that the theme is a central ...
The Victorian era, which lasted from roughly 1837 to 1901, was a time of great change in Britain. The industrial revolution was transforming the country and society, and these changes were reflected in the literature of the time. Victorian writers of the time explored new themes and styles, creating some of the most en...
Science & Tech New Study Reveals Why Cats Have Vertical Pupils Have you ever wondered why your cat’s eyes have vertical pupils, unlike yours and even those of some other felines, such as tigers? A new study reveals an interesting correlation between an animal’s ecological niche and their pupil shape. It has been long k...
In botany, a tendril is a specialized stem, leaf or petiole with a threadlike shape that is used by climbing plants for support, attachment and cellular invasion by parasitic plants, generally by twining around suitable hosts. They do not have a lamina or blade, but they can photosynthesize. They can be formed from mod...
Shapes that look like the remnants of life have been found around ancient hydrothermal vents, possibly representing the oldest fossils ever found. The discovery reopens the question of whether life began near oceanic volcanoes, and indicates that within a few hundred million years of the Earth's formation, life was alr...
Fraction, Latin for 'broken' symbolises a part of a whole number, or in a more general way, equal parts of any number. In regular spoken English, the word 'fraction' is spoken as to describe the number of parts there are of a certain size, like one-third, eighty-fifth, etc. A fraction has two parts, a numerator and a d...
A sample of saltpeter. With the rise of gunpowder usage in various European kingdoms, it became necessary for governments to secure their sources of saltpeter. For instance, during the reign of Henry VIII in England, most of the saltpeter used for gunpowder manufacture in England was imported. Many countries realized t...
Edmond Halley’s southern star catalogue First accurate survey of the southern sky In February 1677 Edmond Halley (1656–1742), a 20-year-old Oxford student, arrived on the British-owned island of St Helena in the south Atlantic to survey the southern stars. The result was the first star catalogue ever compiled with the ...
CS 3604 Research Resources: Search Strategies A Bit of History Boolean operators are named for George Boole (1815-1864), an English Mathematician and Philosopher. Boolean Algebra and Symbolic Logic both derive from his work. Boole is generally considered the father of modern computer science. Most electronic indexes (d...
The Constitution of the United States was signed on September 17, 1787. September 17 is now celebrated each year as Constitution Day. The idea for the day began with Louise Leigh, a senior citizen from California. After Leigh took a class on the Constitution, she wanted more Americans to learn about it and celebrate it...
Study of Ancient Climate Suggests Warming Could Accelerate as CO2 Levels Rise For the first time, a model used to assess climate change has matched the geological evidence of a past warm climate, scientists report. The results underscore the model's predictive powers and suggest that with increasing carbon dioxide leve...
When it rains, it doesn’t always pour. However, water collecting and building up on your property that doesn’t have a proper place to drain can be harmful! Stormwater can contain components, such as sediment, nutrients, bacteria, trace metals, oil, grease, and pesticides. Ensuring that your stormwater is being properly...
Propagation Of Radio Waves Radio waves travel by three different routes from their point of propagation to their point of detection. These three routes are through the troposphere, through the ground, and by reflection off the ionosphere. The first of these routes is the most direct. A radio wave generated and transmit...
What is Osteoporosis? Osteoporosis is a bone disease that affects millions of people worldwide, particularly older women. It is characterized by low bone density and structural changes to the bone tissue, making bones brittle, fragile, and more susceptible to fractures (breaks). Osteoporosis can cause chronic pain, lim...
You know from the previous section that you can form major and minor scales using different intervals. Here too, you can start from any note to create a minor scale following these intervals. 1 tone - (For example: From A to B) 1 semitone - (From B to C) 1 tone - (From C to D) 1 tone - (From D to E) 1 semitone - (From ...
Preservation for the Old South: Discovering a History in the Ruins When the Old Sheldon Church was built in Beaufort, South Carolina between 1745-1755, it was one of the grandest churches in the nation. Today, it stands as a ruin – the embodiment of a romantic view of the southern past. Visitors looking at it may recal...
Measurement concepts are often a part of children’s interactions. “My dad is bigger,” “I can jump higher,” and “I have more Playdough than you!” are common comparisons that children make. From the child’s perspective, these statements compare quantity; however, they provide a nice introduction to measurement. Unfortuna...
Unlock this lesson plan by becoming a paid member. Existing members, please log in. Students will create their own mindfulness practice. By the end of the lessons, students will be able to: - Practice their own mindfulness technique that they created It is said that the best way to learn something is to teach it. The p...
Object-oriented programming is a concept that is used in high-level languages like Java and Python to implement Objects and classes. Polymorphism, Encapsulation, Abstraction, and Inheritance are the four basic building elements of OOP. Other programming paradigms include procedural programming, which involves writing c...
Salmon Versus Seals Game Suggested Grades: ALL - Why are streamside plants important to salmon? - How does human activity near streams affect salmon? - I can tell others how salmon use streamside plants. - I can see how stressful it is for salmon to not have streamside vegetation. - Blue tarp or blanket – approx 10 ft ...
What are the Origins of the Phrase "the Pot Calling the Kettle Black"? The term “the pot calling the kettle black” is usually used in the sense of accusing someone of hypocrisy. The origins of the phrase date back to at least the 1600s, when several writers published books or plays which included wordplays on this them...
With global carbon emissions hitting an all-time high in 2018, the world is on a trajectory that climate experts believe will lead to catastrophic warming by 2100 or before. Some of those experts say that to combat the threat, it is now imperative for society to use carbon farming techniques that extract carbon dioxide...
The majority of fossils recovered in Cape Breton can be traced to coal areas or coal fields. Fossils have been found ranging from whole or partial tree trunks and branches to shrubs and vine growth. Evolution dates back to pre-historic times – to approximately 325 million years ago when the region was covered in lush, ...
Patterns are mostly seen everywhere, and making use of these is essential for every preschooler. Starting them to learn patterns will significantly help their mathematical skills in the future. They can observe and develop their cognitive skills as they go along. Patterns are fun to look out for, and these will make th...
What was Stonehenge used for? Over the years, academics and archaeologists alike have attempted to explain why Stonehenge was built - you may want to see this mysterious site for yourself by trying one of our Stonehenge tours. Plenty of theories have been put forward, but here we will focus on the most commonly accepte...
SAT SUBJECT TEST MATH LEVEL 1 TANGENTS TO A CIRCLE A line or line segment is tangent to a circle if it intersects the circle exactly once. Line is tangent to both circles. and are each tangent to the circle. The following KEY FACT lists four important theorems about tangents. Key Fact J11 • From any point outside a cir...
T (thymine): In genetics, T stands for thymine, one member of the A-T (adenine-thymine) base pair in DNA. The other base pair in DNA is G-C (guanine-cytosine). Each base pair forms a "rung of the DNA ladder." A DNA nucleotide is made of a molecule of sugar, a molecule of phosphoric acid, and a molecule called a base. T...
5.1 Overview of Photosynthesis The process of photosynthesis transformed life on earth. By harnessing energy from the sun, photosynthesis allowed living things to access enormous amounts of energy. Because of photosynthesis, living things gained access to sufficient energy, allowing them to evolve new structures and ac...
Science is key to providing the foundation for understanding the world. Science has changed and continues to change our lives and it vital to the world’s future prosperity. Pupils can develop a sense of excitement and curiosity about natural phenomena and are encouraged to understand how science can be used to explain ...
Restriction enzymes belong to a group of enzymes called endonucleases. They are also called restriction endonucleases or restrictase. These enzymes recognize specific sequences on double-standard DNA (called restriction sites) and cleaves both strands resulting in fragmentation or linearization (in case of circular DNA...
Early education is crucial for building a strong foundation for lifelong learning. The first few years of a child’s life are the most critical for brain development, and early education programs can help children develop cognitive, social, and emotional skills that will benefit them throughout their lives. In this arti...
Health is a state of complete physical, mental, and social well-being. It is defined by the World Health Organization (WHO) as the absence of disease or infirmity. Different people define health in different ways. Here are some common definitions. The World Health Organization defines health as: (i) the absence of dise...
Lungs provide air-breathing vertebrates with an efficient and often intricate surface for the exchange of oxygen and carbon dioxide. However, they require a mechanism for the air within them to be repeatedly replenished. Animals achieve this in a variety of different ways, but most suck air into the lungs by generating...
Lessons of the Indian Epics: The Ramayana “You do not know dharma, or worldly affairs, or the laws governing enjoyment, nor the people's behavior in different conditions and circumstances: and yet you blame me. The whole earth belongs to the kings descended from Manu and therefore my forefather Iksvaku. The present rul...
What is a Root Directory? A root directory is the top-most directory in computer file systems. It sometimes is referred to as the parent directory or the home directory. In can contain many other directories or sub-directories. The term "home directory" is not a completely accurate reference to the root directory when ...
A new kind of orchestral composition, the concerto, appeared in the last two decades of the 17th century, and became the most important type of Baroque orchestral music after 1700. The concerto was the synthesis in purely instrumental music of four fundamental Baroque practices: the concertato principle; the texture of...
Best practices for Composting Composting is a process of decomposing organic matter to create a rich, soil-like substance known as compost. Here are some best practices for composting: - Balancing Greens and Browns: To create compost that breaks down efficiently, it is important to maintain a balance of carbon-rich “br...
This PDF pack is designed to support teaching reading skills in preparation for the end of KS2 SATs reading test. It should be used in conjunction with the 2018 KS2 reading test materials. Year 6 pupils will have the opportunity to answer questions using retrieval skills, inference and explaining the meaning of vocabul...
/ovutxzsh9ts: How to Create Articles with No Meaning Words: Writing an article can be a challenging task. But if you know the basics of writing, you can make your work easier. In English, there are two kinds of articles: definite and indefinite. Definite articles are ‘the’ and ‘a’; indefinite articles are ‘an’. They in...
Sea Turtles, Dolphins, and Whales - 10 years after the Deepwater Horizon Oil Spill More information on the Deepwater Horizon Oil Spill in 2010 and its effects on surrounding marine life. Deepwater Horizon Oil Spill The 2010 Deepwater Horizon oil spill adversely affected wildlife throughout the Gulf of Mexico, including...
Accelerators and particle detectors > How do we experiment with tiny particles? > Detectors Just as Rutherford used zinc sulfide to test for the presence of invisible alpha particles and used this knowledge to determine the path of alpha particles, modern physicists must look at particles' decay products, and from thes...
Juneteenth is the original African-American holiday. Most folks are familiar with African-American History Month in February and Kwanzaa in December. Many people also celebrate Martin Luther King's Birthday, which is now a federal holiday. But Juneteenth commemorates the end of slavery, the central event in African-Ame...
A coil heat exchanger is a type of heat exchanger that consists of a coil-shaped tube or multiple tubes wrapped around a core. The coil heat exchanger works by circulating hot or cold fluid through the coil, which transfers its heat to or from the surrounding environment. The heat transfer occurs through the walls of t...
In much of California and particularly in the Sierra Nevada, the frequency, size and intensity of wildfires are increasing, destroying the precious resources our forests provide. And this trend, documented with a great deal of research, is predicted to continue. Due to the heavy build-up of hazardous fuels, few forest ...
Welcome To Art Foundations!The art Foundation course is the first course that High School students are introduced to when starting High School. The art Foundation course is a course that gives High School students a basic building block on how to use techniques while exploring new mediums as well as gives them an intro...
An IP address tells computers how to find a certain device within a computer network. An IP address is like an address label for information packets. For each network your computer is connected to, it has a unique IP address on that network. So, one device can have several IP addresses at the same time. In most home co...
The first state to secede from the Union was South Carolina. Significantly, this was not the first time that the people of South Carolina had discussed secession. During the debate over tariffs in the 1830s, South Carolina seriously considered secession. Fortunately, John C. Calhoun helped to solve the problem and Sout...
If you faced north from the summit of Whiteface at the end of the 1800s, you would be looking at a landscape filled with patchy parcels of stumps as far as the eye can see. In that era millions of logs were cut and floated out of the region on rivers. As a result, forest fires became widespread, and runoff from over-lo...
This week I learned about a condition called Williams syndrome, a disorder that neuroscientists have called the most compelling model available for studying the genetic basis of human behaviour. It affects an estimated one in 7500 births, making it one-tenth as common as Down syndrome. Like Down syndrome, it can cause ...
Teaching materials ages 12-15 Teaching materials ages 12-15 At the same time, teaching materials encourage the beginning of critical thinking. Video and audio materials for this age group tell stories of refugee children of the same age as the pupils by discussing familiar and relevant topics such as why and how people...
Last updated on July 13th, 2020 at 02:34 pm. Hey, and welcome back. So in the last video we said that we’re going to look at variable hoisting. But before that, we need to look at variable scoping. So scoping basically defines how a variable is usable. Is it a local variable or a global variable. A global variable is a...
\|Calcite (calcium carbonate)\| Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor. Chalk is common throughout Western Europe, where depo...
The Council of Trent, "in session off and on for eighteen years from 1545 to 1563, was one of the most important councils in the history of the Roman Catholic Church" (1). The Council made many decisions for the church during its years in session in an effort to establish the traditions and doctrines of the church, as ...
Malcolm X Speeches In 1964, Malcolm X had presented a speech to the public, about our country, and its racial issues. He talked about two different types of Afro- Americans in the United States of America with conflicting persepectives. In 1964, Malcolm X had presented a speech to the public, and in this speech he spok...
The Common Snapping Turtle (Chelydra serpentina) is a large freshwater turtle of the family Chelydridae. Its natural range extends from southeastern Canada south, west to the Rocky Mountains (and beyond, where introduced), throughout Mexico, and as far south as Ecuador. This species and the larger Alligator Snapping Tu...
A pair of spacecraft that meticulously mapped the moon's gravitational field has helped astronomers solve the long-standing mystery of why the moon is so gravitationally lumpy. A team of scientists used data collected by NASA's twin Grail probes— which ended their yearlong gravity-mapping mission in December 2012 by cr...
The serious games research has indicated that learning by playing games may support knowledge construction, engage learners, provide learning methods that correspond better with students’ requirements, as well as enhance classroom dynamics, concentration, and self-esteem. However the recent research has also proposed t...
The immune system is made up of specific cells, proteins, tissues and organs that protect people from germs and microorganisms every day .In most cases, the immune system does a great job of keeping people healthy and preventing infections. But sometimes immune system problems can lead to illness and infection. About t...
Causes and effects of the Glorious Revolution What was the Glorious Revolution? The Glorious Revolution is the name given to a series of events that took place in the late 17th century in England. It was one of the final and decisive developments in the power struggle between the parliament and the monarchy in England....
In most civilisations the horse was used more in chariots than for riding until about 800 BC. Before stirrups most equestrian cultures used no support for the feet at all. There are records of a loose surcingle being employed behind the girth, into which the feet could be tucked. Toe stirrups (loops of rope which held ...
Common Core Standards: Math 6. Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b. Joe Weakleg is ...
This is a speaking focused advanced high school ESL lesson plan with the theme renewable energy. It worked really well at my science focused high school and as it is quite an interesting topic I'm sure it would work well in any advanced class. If you use this lesson I would love to know how it goes, so please leave a c...
Conversion of natural habitat to cropland is one of the greatest threats facing biodiversity in the tropics. Between 1999 and 2008 cropland in tropical countries expanded by c.48,000 km2 per year. As global food demand rises, areas that were once thought to be relatively safe from conversion are now increasingly at ris...
Soldering (pronounced sa-der-ing) is a process where you join two or more metals by melting a filler metal called solder into the joint where the metals meet. The filler metal melts before the other metals because it has a lower melting point than these metals. Soldering is often used to make jewelry and stained glass,...
The latest news about space exploration and technologies, astrophysics, cosmology, the universe... Posted: Jan 25, 2013 Chameleon star baffles astronomers (Nanowerk News) Pulsars — tiny spinning stars, heavier than the sun and smaller than a city — have puzzled scientists since they were discovered in 1967. Now, new ob...
The number of hurricanes occurring annually on a global basis varies widely from ocean to ocean. Globally, about 80 tropical cyclones occur annually, one-third of which achieve hurricane status. The most active area is the western Pacific Ocean, which contains a wide expanse of warm ocean water. In contrast, the Atlant...
Katherine Crawford's fifth-graders at West Oak Middle School in Mundelein asked, "What kind of habitats did dinosaurs live in?" The world was a very different place when supersized reptiles called dinosaurs dominated the earth more than 200 million years ago. Contact information ( * required ) When they initially emerg...
Routers perform two main functions: switching and routing. The switching function is the process of moving packets from an inbound interface to an outbound interface. The switching function is also responsible for stripping the data link layer information from a packet it receives and encapsulating it with the data lin...
A chisel is a tool with a flat, sharpened end used to remove material from wood, metal or stone. The sharpened edge is typically made from a hard metal. Chisels can be used by hitting the non-sharpened end with a mallet or they might be pressed against a spinning piece of wood or metal such as might be found on a lathe...
Sedimentary rocks are found covering a majority of the Earth's upper crust. Formed from the deposition of mud and sand that is buried and compressed to form solid rock, sedimentary rocks usually begin their life underwater, rising to the Earth's surface as the waters dry up. Weathering and erosion break rocks into smal...
— OR — Using this Make a Snowman Worksheet, students follow directions to build a snowman. Following directions is an essential skill for students to be able to do. This worksheet will help your students to practice this skill while building a snowman. On this worksheet, students will create a snowman with the pieces p...
\|Part of a series on\| The Italic peoples descended from Indo-Europeans who migrated into Italy in the second millennium BC. Latins achieved a dominant position among these tribes, establishing ancient Roman civilization. During this development, other Italic tribes adopted Latin language and culture in a process known ...
Videos are a great resource for language teaching and learning! Students enjoy watching animated shows and videos on TV, on tablets, and on phones. Videos can motivate students to engage with language, so it’s easy to understand why teachers want to bring more videos into their English classrooms. There are strong peda...
Our editors will review what you’ve submitted and determine whether to revise the article.Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work! - Basic concepts and features - External and internal influences - Modes of sexual attraction - Post-fertilization ...
A number of degenerative eye diseases are related to photoreceptors no longer functioning properly. There can be a host of reasons that photoreceptors don’t work, but soon it may not be that important to know why the disease is happening. That is because researchers at University of California, Berkeley have come up wi...
From at least 1766BCE to the twentieth century of the Common Era China was ruled by dynasties. A dynasty is a ruling family that passes control from one generation to the next. A dynasty does not have to last for a long time. One Chinese dynasty lasted more than 800 years while another lasted only fifteen years. The an...
African Americans, both free and enslaved, served in the American and British armies as armed troops and as laborers known as "pioneers." In many places, slaves were offered freedom if they agreed to fight for the British. Large numbers of slaves deserted their plantations, particularly in the lowcountry. But as far as...
This classic introduction to the modern fairy tale sets a story in the distant past, usually in a land far far away, and changes the tone of everything that follows. It’s possibly one of the most powerful narrative devices in the English language. After we hear those words, we expect that everything that follows will b...
We may have many differences among us; different classes, beliefs, countries, occupations, and even tastes, but one thing that all of us have in common is our microscopic blueprint… we are all made of atoms. This isn’t just shared among fellow humans; rather, it is the case for every form of matter that exists, from ba...
In this video, the instructor goes through the steps needed to graph a system of linear inequalities. He discusses slope, shows how to draw the line on the coordinate plane, and explains what section of the graph should be shaded. There is some shadow on the white board which makes it a little more difficult to see at ...
Northeastern Siberia has been inhabited by humans for more than 40,000 years but its deep population history remains poorly understood. In a new study, published in the journal Nature, researchers investigated the population history of the region through an analysis of 34 ancient human genomes that date to between 31,0...
Struggling with ways to reinforce key math concepts at home? Having a difficult time understanding the homework? Confused with the way math is being taught? Experience that Matters We are here to provide support and a better understanding of the way math is presently being taught in schools. Concepts that are taught in...
NNAT Test Sections The NNAT (Naglieri Nonverbal Ability Test) is a nonverbal test, which means that all the questions rely on shapes and figures instead of pictures or words. These tests assess a child’s thinking and reasoning abilities as opposed to what he or she has learned in school. The NNAT can be administered vi...
There’s a new sight in the sky these days – the newly-discovered Comet NEOWISE is flying past the Sun. This marks the first time since the 1990s that people have had a chance to see a comet with their bare eyes. A comet is basically a ball of dirty ice that orbits the sun. As the comets come close to the sun, the sun m...
In order to write a quality essay or discussion, you must first have an understanding of what you are being asked to do. Recognizing action words or verbs used in your assignment prompts will help you broaden your vocabulary, identify specific directives, and organize your ideas accordingly, which will help you write m...
This chapter has focused primarily on one central topic in social psychology: namely, the ways that we learn about and judge other people—our social cognition. The ability to make accurate judgments about our social situation is critical. For example, if we cannot understand others and predict how they will respond to ...
Sunspots and Magnetic Fields Sunspots are caused by extremely strong, localized magnetic fields on the Sun. "Jet streams" of plasma that form deep within the Sun's convective zone produce powerful magnetic fields. When these loops of magnetism, or magnetic "ropes", generated by flowing plasma break the visible surface ...

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