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YOU can't put a square peg in a round hole. But putting a square aperture on a round telescope might be the best way to see the light of distant, Earth-like planets. At least, that's what computer simulations of a new extraterrestrial telescope predict. Whenever light passes through an aperture, some of it spreads. Thi...
A fossilized foot bone recovered from Hadar, Ethiopia, shows that by 3.2 million years ago human ancestors walked bipedally with a modern human-like foot, a report that appears Feb. 11 in the journal Science, concludes. The fossil, a fourth metatarsal, or midfoot bone, indicates that a permanently arched foot was prese...
Teaching Children to Recognize Emotions With Art The key to teaching children to recognize emotions is by getting hands on and involving them in the teaching and learning process (like in this post on learning to identify emotions with cupcakes). Using art is another great way to do just that! Why Is Teaching Children ...
(PRWEB) March 21, 2005 The tragic tsunami that struck the Indian Ocean on December 26, 2004, killing or injuring many hundreds of thousands of people and causing unthinkable damage, demonstrates all too clearly the devastation that tsunamis can wreak. But what are the precise scientific causes of such tidal waves? What...
Ideas to try.... Science and Technology If sailing vessels were still the best means of transportation and communication, where would you choose to live? How did communities change when sailing vessels were no longer the best means of transportation, and you could now go everywhere by automobile? Discuss the effect of ...
The exhibit presents the story of Jan Karski and the events that led to Holocaust survivor Elie Wiesel’s assertion that “Thanks to him, more than one generation continues to believe in humanity.” During World War II, as a courier of the Polish Underground State and emissary of the Polish government-in-exile, Jan Karski...
Working with Tessellations Tessellations can be defined as a repeated pattern on a flat that uses geometric shapes with no spaces or gaps. When I think of ones that I see in everyday life, they are present on floors, wall tiling, and tapestry. There are patterns present everywhere. The more intricate the pattern, the m...
Osteoporosis is a disease of the bones. It happens when you lose too much bone, make too little bone or both. As a result, your bones become weak and may break from a minor fall or, in serious cases, even from simple actions, like sneezing or bumping into furniture. Osteoporosis means “porous bone.” If you look at heal...
Ampere's Experiments on Currents in Wires Ampere extended Oersted's observations. If a current could generate a magnetic field, then presumably, two wires carrying currents in close proximity should be able to interact magnetically. He showed that this interaction existed, and that the wires exerted forces on each othe...
Also known as: Alexander Pierre Tureaud AAlexander Pierre (“A.P.”) Tureaud was a key legal activist in an era of vigorous challenges to Jim Crow in twentieth-century Louisiana. From the beginning of his legal career in New Orleans in the 1920s until his death in 1972, Tureaud directed the most substantive assaults on r...
Reading guides are simply straight edges that help students focus their reading line-by-line. Students can lay the reading guide under the line of text they wish to read, pulling it along as a way of visual tracking. Reading guides can be made in a number of ways. One easy way is to simply use an index card. Another wa...
Section 1: Introduction By the late 18th century, many American explorers and traders had made their way to the northern Great Plains. They usually came by boat or on foot. Both traders and explorers contributed to the accumulated knowledge about the rivers, lakes, hills, plants, animals, weather, villages, and people ...
As astronomers gaze toward nearby planetary systems in search of life, they are focusing their attention on each system's habitable zone, where heat radiated from the star is just right to keep a planet's water in liquid form. A number of planets have been discovered orbiting red dwarf stars, which make up about three-...
NEWTON'S LAWS OF MOTION Force and Motion Newton's third law of motion states "if a body exerts a force on a second body, the second body exerts an equal and opposite force on the first." This law has also been stated as, "for every action there is an equal and opposite reaction." The third law is basic to the understan...
About This Chapter High School Algebra: Algebraic Expressions and Equations - Chapter Summary There are a full range of algebraic expressions and equations to learn, but to do so you must first know the basics of how to read these problems and what steps to take to find the answers. This chapter has been designed to re...
The students drew a number between 15 and 20 from a bag. Then they made the number on their ten frame. Then they made towers of 5 and shared with their partner how many towers of five and how many left over they had to equal the number they drew. They also drew numbers 15-20 from a bag and then made the number using to...
As the name suggests, European starlings are introduced birds from across the sea. Originally released in 1908 in New York City’s Central Park in an attempt to establish every bird mentioned in the works of Shakespeare to the New World, starlings have spread like wildfire. Now common and well established in all corners...
Byriġ: The Early Medieval Anglo-Saxon Fortified Settlements The Byrig (singular form in Old English: Burh/Burg; pronunciation: [‘burx]) were a series of Anglo-Saxon fortified settlements of the 9th century built as defensive strongholds against the incursions of the Norsemen (mainly Danish Vikings) who had been recurre...
Babies in bilingual environments can learn to distinguish the grammatical structures of two different languages at a young age, a new study finds. The research shows that bilingual tots use qualities like pitch and duration of sounds to keep two languages separate. And infants can perceive these differences between lan...
In this tutorial, the instructor shows how to compute the surface area of a regular pyramid. A regular pyramid has four equal sides which are in triangle form, and the base in square form. Its surface area is four times the area of its side plus the area of its base. He goes on and takes an example with sample values a...
How I Use It Our Grade 6 students built an ancient Roman village together. Students learned about Roman culture and history as they built. After students created individual and small-group residences, they collaborated on larger public structures like bath houses. We're lucky to have a wonderful social studies teacher ...
Lesson 1 (from Introduction) Jean-Jacques Rousseau wrote the First and Second Discourses and was a philosopher, writer, and a composer. The objective of this lesson is to examine the author of the First and Second Discourses, Jean-Jacques Rousseau. 1) Independent Work: Library Research: Students should find answers to ...
Our aim is for children to feel confident and positive about their maths, to engage actively in mathematical activities, becoming increasingly responsible for their own learning, and to develop understanding of how and when to apply the skills and concepts they have learned. Our main planning resources for mathematics ...
The Supreme Court has retained so many traditions that it is in many ways the same institution that first convened in 1790. Many legal historians call it "the first court still sitting." The Constitution elaborated neither the exact powers and prerogatives of the Supreme Court nor the organization of the Judicial Branc...
Veterans Day provides such an excellent opportunity to discuss our United States constitution and the freedoms our children might take for granted, while honoring those who have fought and lost their lives to protect them. The first Veterans Day (actually at the time called Armistice Day) was commemorated in 1919 on th...
At the top of the stairs leading to the third floor rotunda of the Massachusetts State House in Boston is a colorful mural, ten feet high and fifteen feet wide, that depicts the soldiers of the Sixth Massachusetts Volunteer Infantry Regiment fighting a well-armed mob of angry civilians in Baltimore, Maryland, on April ...
With hydrogen atoms consisting of just a single electron and single proton, its gaseous form made up of two hydrogen atoms can be hard to contain. Hydrogen storage, along with hydrogen production and the lack of infrastructure, remains a major stumbling block in efforts to usher in hydrogen as a replacement for hydroca...
Phoneme blending refers to the ability to identify a word when hearing parts of the word (phonemes or syllables) in isolation. This is a very important step in the development of literacy, as well as general language development. A child whose skill in this area is emerging will be able to hear two separated words, lik...
Students will learn about Isaac Newton and the things he discovered such as the 3 laws of motion. They can complete a worksheet like this so they have a better understanding about Newtons findings - AA Introduction to Newton's first law of motion activity. This hands-on activity is an excellent introduction to Newton’s...
The most powerful person in ancient Egypt was the pharaoh. The pharaoh was the political and religious leader of the Egyptian people, holding the titles: ‘Lord of the Two Lands’ and ‘High Priest of Every Temple’. As ‘Lord of the Two Lands’ the pharaoh was the ruler of Upper and Lower Egypt. He owned all of the land, ma...
Like independent reading, when it comes to writing Malaysian students typically cannot write anything they haven’t already seen first. Sentences are copies from texts, and students find it very difficult to write their own sentences. “Work on writing” forces them to try to write on their own. Like “read to self,” “work...
A regular criticism leveled at education is the function (and sometimes the lack of) creativity in motivating and inspiring learning. Creativity these days is seen as something ‘special’ and worth capturing. However, when it comes to creativity in education, there are many aspects to consider. Every student is creative...
In a classroom, students may be asked to show how they solved a math problem. Teachers may show students how to use microscopes correctly. In both situations, the activity requires a demonstration of how a task is accomplished. The word show can be used as a verb or as a noun. To show artwork is to let people see it. A...
Nobody "discovered" Stonehenge; since its construction, the existence of the monument is likely to have been known. The earliest written references to it are found in "Historia Anglorum" by Henry Huntington and "History of the Kings of Britain" by Geoffrey of Monmouth, both written in the 12th century.Continue Reading ...
James, or Jim Larkin was an activist who left his mark on labor and fair employment rights in Ireland in the early 1900s. He had an unusual history marked by multiple great achievements and great failures. But at the end of it all, Larkin won the rights for thousands or Irish men to work and be protected by a union reg...
Quotes and citations are essential to any good argument, research paper, essay or forms of written expression. Quotes allow the author to better communicate with their readers. Quotes help prove a point, emphasis data, prove data, or simply to show the readers where the author is coming from in written work. There is a...
The Victorian era has long been associated with an idealized vision of Christmas. Where did this modern notion originate? Christmas before 1840 In the eighteenth century, Christmas was treated with indifference. Open rejoicing and displays were deemed signs of low social standing. In the eighteenth and nineteenth centu...
|Date(s):||March 4, 1869 to February 3, 1870| |Location(s):||Charlotte, North Carolina| |Tag(s):||amendments, Civil War, History, Reconstruction| |Course:||“U.S. Civil War and Reconstruction,” Richard Bland College| The document shown here is a copy of the 15th Amendment, which granted people of all color and race the ...
Water is neutral and has a pH of 7. Acids are substances that produce hydrogen ions when added to water (H+ ions). When we dissolve a susbance in water we make an aqueous solution (aq). Hydrogen ions make solutions acidic, because they have a pH of less than 7. Bases can react with acids to neutralise them. Alkalis are...
Directly or indirectly, tens of thousands of Europeans were involved in the Atlantic slave trade. From the earliest days of post-Columbus exploration and settlement to the last slave voyages in the 1860s, millions of Africans were shipped to the Americas in European and American slave ships. Viewed from Europe, it seem...
The origin of flowering plants (Division Angiospermae) is currently contested. There are several hypotheses to the origin of flowering plants, two of which are most prominent. It was originally thought that flowering plants originated from gnetophytes, due to the similarity in morphology of xylem and pollination associ...
Agriculture and labor-intensive manufacturing remain the 2 major pillars of the Bangladeshi national economy. Historically, a tropical climate and warm temperatures throughout the year made it possible to grow 2 or 3 crops of rice each year, although floods and cyclones regularly damaged crop yield. Flourishing trade, ...
Solar For Your Home Taking a look at how solar panels operate: The basic principles of solar panels are pretty well known: sunlight hits the panel and electricity comes out. However, the process in between remains a mystery to many people, who often wonder, “How does it work?” “How do you go from a ray of sun to poweri...
Yeasts constitute a group of unicellular fungi, which convert sugar to alcohol like in the fermentation of alcoholic beverages process. Yeasts are eukaryotic micro-organisms classified in the kingdom Fungi, with about 1,500 species currently described; they dominate fungal diversity in the oceans. Most reproduce asexua...
What Were the Causes of Germany's Hyperinflation of 1921-1923? Among the defining features of early twentieth century Europe and one of the contributing factors to World War II, was the economic maelstrom known as “hyperinflation” that ravaged Germany from 1921 until 1923. Although the short period is often overlooked ...
Laws Related to Heat and Temperature All bodies emit thermal radiations. Prevost’s theory of heat exchange says that substances at all finite temperatures emit radiations, the amount of which increases with the increase in temperature. It is not even affected by the presence of surrounding bodies. The temperatures of a...
The Second Great Awakening was a religious movement of the United States which began in late 18th century and lasted until the middle of the 19th century. The awakening had created among the people a heart for reform. It was an encouragement to education. Universities of Pennsylvania and North Carolina were established...
By: Rachel Barry In Illinois, we switched from the ACT to the SAT as our standardized test. The math department's digital curricula were originally developed based on the ACT College Readiness Standards, however, we made some changes this summer to also prepare our students for the ACT. You can read more about these ch...
It’s no surprise that some of the most useful reading skills are also some of the most difficult for kids to master. Skills like making inferences, characterization, and making use of text structures take practice. Kids gradually become proficient at these deeper thinking skills by putting them to use. One good way to ...
Resistors and Resistance Resistance, one factor of Ohm’s law, is the counterpart of the the electrical current and opposes the current, hence its name. In Ohm’s Law, V=I*R, the resistance is measured by R=V/I. For example, if the Voltage is 5V and the Current is 20A, the Resistance must be 1/4 ohms. Resistance, which m...
Answer: The 13th amendment, abolishing slavery in the U.S. The 13th Amendment to the United States Constitution was passed by the Senate in April 1864, passed by the House of Representatives in January 1865, and officially adopted and proclaimed enacted in December 1865. This amendment abolished slavery and involuntary...
Areas in Square by Dissection The July 15 issue of the NCTM Newsletter contained the following problem: In the figure below, quadrilateral ABCD is a square, and E is the midpoint of the side AD. How do the areas of regions I, II, III, and IV compare? Another way to think about this is to consider the question, What are...
In today’s educational environment, the effective use of data is essential to the teaching and learning process. Data is not only used to inform instructional decision making, but it also serves as the primary accountability measure at all levels within a school system. In the classroom, within a school building, and a...
Studying economics in high school with the intent to take the AP Microeconomics and/or Macroeconomics exam for college credit or placement into advanced coursework in college calls for understanding the basic premise and language of the subject. When thinking of economics, you should be aware of one simple synonym — ch...
(i) Here, in the figure, the electric, lines of force emanate from A and C. Therefore, charges A and C must be positive. (ii) The number of electric lines of force emanating is maximum from charge C here, so C must have the largest magnitude. (iii) Point between two like charges where electrostatic force is zero is cal...
It’s one of the big unsolved whodunits in history: What killed off the dinosaurs? Scientists are pretty sure that something awfully big slammed into the planet about 66 million years ago, but many suggest that headlong volcanic activity may also have played a major role in the demise of our giant, feathered friends. Ne...
On November 25, 1865, Mississippi created the first of the Black Codes. Designed to recreate slavery in all but name, this signified the white South’s massive resistance to the freeing of their labor force and the lengths to which it would go to tie workers to a place under white control. The impact of slavery’s end is...
Flicker colors are optical illusions caused by motion. In this Demonstration, the rotating figure is black and white, and it appears black and white when it is still or when rotating slowly. If you increase the rate of rotation (by clicking the double up arrows a few times), you will begin to see yellow in the inner ha...
- Discovery: Known to the ancients and visible to the naked eye - Named for: Messenger of the Roman gods - Diameter: 3,031 miles (4,878 km) - Orbit: 88 Earth days - Day: 58.6 Earth days Mercury is the closest planet to the sun. As such, it circles the sun faster than all the other planets, which is why Romans named it ...
Home > Preview The flashcards below were created by user on FreezingBlue Flashcards. - is the vibration of Earth produced by the rapid release of energy within the lithosphere. - Earthquakes are caused by slippage along a break in the lithosphere. - are fractures in Earth where movement has occured. - the point within ...
California has the largest water storage and transportation system in the world. With 1,200 miles of canals and nearly 50 reservoirs, the system captures enough water to irrigate about four million acres and provide water to 23 million people. Without this extensive management system California’s limited water resource...
'Henry VIII' was a collaborative work by William Shakespeare and John Fletcher. After Shakespeare’s death in 1616, Fletcher replaced him as the house playwright for acting troupe The King's Men. It was a known fact to literary experts that the play was written by both Shakespeare and Fletcher, but it remained unknown a...
Weights and Measures British designers and engineers used the Imperial system of weights and measures (pounds, stone, inches and feet). French used Metric (grams, kilograms, centimetres and metres). Panels, components and every single item had to fit perfectly together and some parts were made in the UK and others in F...
Table of Contents : Top Suggestions Physical Science Momentum Worksheet : Physical Science Momentum Worksheet This cool physics worksheet momentum and moment of inertia by using the example of when a figure skater tucks her arms in to accelerate during a spin kids can also conduct a fun experiment in an The diversity o...
The Dead Sea Scrolls were first discovered in 1947. The collection consists of more than 900 scrolls that include biblical texts as well as sectarian literature. They were discovered in the area known as Qumran among the caves overlooking the Dead Sea not far from Jericho. Early on it was suggested that the scrolls wer...
The idea of the sphericity of the Earth was not very difficult to accept. The projection of the shadows of the Earth on the Moon during partial eclipses and the shape of the Moon and the Sun, were the signs with which Nature argued against those flat worlds full of precipices for hell. The Greeks already accepted the s...
An aneurysm is a weak area in the wall of an artery which leads to a balloon or pouch formation. The wall of the pouch is thinner than the rest of the artery wall and is at risk of breaking. This type of aneurysm is known as a berry aneurysm, or saccular aneurysm, based on the way it appears. If the aneurysm breaks, th...
Number and Algebra A fraction has a number on top and a number down below. These numbers have special names. The top number is called the numerator. The number down below is called the denominator. The line between the numerator and the denominator is called the vinculum. Equivalent fractions are equal even though they...
Capitals of USA Until 1800 the United States of America had five "capitals" or meeting places of the Congress - Princeton, Annapolis, Trenton, New York and Philadelphia. For various reasons, none of these cities offered an ideal seat of government for the new nation. Southern states protested that they were all too far...
This page from the U.S. Department of Education provides ideas for language-building activities to do to develop literacy skills. The activities and roles for both children and parents change as the child grows. The different stages addressed are: babies (birth to 1 year), toddlers (1 to 3 years), preschoolers ( ages 3...
Plants have been working overtime to mitigate climate change The question is, how long can this positive relationship between hard-working photosynthesizing plants and atmospheric carbon levels continue? Plants and trees take in carbon and emit oxygen as part of the photosynthesis process. Forests and green spaces serv...
Marajo is a large island at the mouth of the Amazon River. Scientists have been puzzled by a group of 60 man-made hills at one site on the island, called Pacoval. These hills were constructed so that their tops would be above water during periods of flood or very high tide. Some of the hills served as cemeteries, and o...
What type of mixtures can be separated by filtration? Filtration is a separation process in which a mixture is passed through a filter that allows one component to pass through uninhibited but blocks another component from passing through. In general this method sorts by size, with the filter acting as a barrier that a...
Students learn how the process of soil solarization is used to pasteurize agricultural fields before planting crops. Soil solarization is a pest control technique in agriculture that uses the sun’s radiation to heat the soil and eliminate unwanted pests that could harm the crops. The approach is compared to other pest ...
Throughout the younger islands of the Hawaiian archipelago, dryland agricultural field systems constituted a significant component of the late prehistoric subsistence economy. The field systems produced large quantities of food to support local farmers and residents, as well as local and district-level chiefly elites. ...
All of us would have heard about archaeology, but the term Stratigraphy seems to be trending in the modern day archaeology world. So what exactly do we mean by Stratigraphy?. Stratigraphy, the modern term for archaeological theory and most of the modern exposure, processing and recording techniques, are based on Strati...
Extremophiles are organisms that have been discovered on Earth that survive in environments that were once thought not to be able to sustain life. These extreme environments include intense heat, highly acidic environments, extreme pressure and extreme cold. Different organisms have developed varying ways of adapting t...
2. Support Counting skills and Develop one-to-one correspondence understandings 3. Practice Patterning skills - With 2 colors, students can make and name a variety of patterns (AB, AABB, ABB, AAB, etc…) 4. Build Spatial Sequencing skills - Place different colored circles in a design of your choosing in one row. In the ...
Crime in Britain increased during the Industrial Revolution, especially in the expanding cities. Thousands, flocked in from the countryside but they could struggle to find work in the industrialised world. People stole simple things like food and clothing to survive. If they were caught (normally by the victim of the c...
This diagram shows evidence for seafloor spreading. Click on image for full size D. Roddy and LPI Pacific Rim of Fire The diagram shows a remarkable fact about the surface of the Earth. Around the rim of the Pacific Ocean are many volcanoes. The rim of the Pacific Ocean also is the scene of much earthquake activity. Th...
The underground railroad was a system of safe houses that stretched from the south all the way to Canada. The purpose of the safe houses was to hide and protect runaway slaves trying to reach freedom in the north. It is estimated that over 100,000 slaves escaped through the underground railroad, though many more tried....
Life on this planet is dependent on the availability of water. Scientists are always looking for evidence of water in other worlds because water is the solvent that drives life here on earth. Water exists naturally in solid, liquid and gaseous forms. It is the only substance on our planet that exists naturally in all t...
For today's task, you need to be able to identify the different features of a set of instructions. Remember the following: -an imperative verb is a bossy doing word (put, mix,make etc) - a time conjunction is a word that tells you when something is happening (next, then, after etc) We have also uploaded another reading...
By the late 19th century, the scramble for Africa had become very intense. European colonies were not only interested in the slave trade but realized the availability of natural resources that could make their countries richer and bring world dominance. The conquest of Africa took place between the 1820s t0 1911 in the...
The northernmost of the Northwest Coast Indians are the Tlingit. They live on the islands and coastal lands of southern Alaska, in the United States, and in northern British Columbia, in Canada. Their language, also called Tlingit, is related to the Athabaskan languages. According to Tlingit traditions, some of their a...
Recent solar research is bringing down the cost of solar as well as increasing efficiencies. It is also expanding the use of solar in ways that can help solve environmental problems, like the need for clean drinking water. Here we present the latest cutting-edge research from around the world that is advancing solar te...
In 1796, the scientist Edward Jenner injected material from a cowpox virus into an eight-year-old boy with a hunch that this would provide the protection needed to save people from deadly outbreaks of the related smallpox virus. It was a success. The eight-year-old was inoculated against the disease, and this became th...
While artificial leaves hold promise as a way to take carbon dioxide — a potent greenhouse gas — out of the atmosphere, there is a “dark side to artificial leaves that has gone overlooked for more than a decade,” according to Meenesh Singh, assistant professor of chemical engineering in the University of Illinois at Ch...
Radiation dose is a measure of the amount of exposure to ionizing radiation. It is known, that ionizing radiation can penetrate the human body or an object. The energy absorbed from this exposure to radiation is called a radiation dose or simply a dose: absorbed, equivalent, and effective: - Absorbed dose, - Equivalent...
Front and back, top and bottom, and left and right are ideas that we use to describe objects in our three-dimensional world. Young children learn these positional words in Kindergarten. In fact, learning the meaning of these words is one of the Common Core Kindergarten geometry standards. In reality these are big ideas...
National Geographic Grantee and Texas State University Research Faculty Frederick “Fritz” Hanselmann and a team of leading archaeologists are conducting an expedition to the Monterrey Shipwreck in order to carry out the deepest archaeological shipwreck excavation ever in North America. Follow along with Fritz’s updates...
Today is exciting because I get to do two things. 1: Post the first successful images of West Nile virus infectined cells that I took on my own and 2: Give a basic explanation one of the most visually impressive techniques at our disposal: immunofluorescent microscopy. For those of you not familiar with fluorescent mic...
An infection of the upper airway which generally affects children and causes obstruction in breathing and a telltale barking cough is referred to as croup. Inflammation around the bronchi or bronchial tubes, trachea or windpipe and larynx or vocal cords is the reason for the cough and other croup symptoms. Young childr...
Establishment of responsible government in United Canada A responsible government is a government that is accountable to the elected representatives of the people. This means, for example, that government ministers are accountable to Parliament for their actions and decisions. The term “responsible government” is also ...
Art for human rights and social justice refers to the use of artistic expression to advocate for and raise awareness of issues related to human rights and social justice. This form of art is often used as a tool for activism, as it has the power to convey powerful messages and provoke emotions in viewers. Art for human...
The small size and thin shape of the weasels, so essential to the profession of burrow-hunting rodent predator and so advantageous in competition with other rodent hunters, have both advantages and disadvantages (Figure 2.8). The small size and long, thin shape of a weasel's body affect the whole of the rest of its lif...
The environment has a huge impact on children because of their constant interaction with it. And, as little beings full of wonder and curiosity, there are so many opportunities to teach them about sustainable practices. It also helps that the Black Rock centre is designed with naturalistic playscapes that create sensor...
A latching relay is an electromechanical switch. Latching relays are electronic parts that are used to control large flow of electrical current with smaller flow of current. Relays are typically used when small continuous electrical currents must be used. A latching relay, however, is used to control large currents wit...
50 Years After the Fair Housing Act: What African Americans need to Know April is Fair Housing Month. Moreover, this April marks the fiftieth anniversary of the Fair Housing Act of 1968. So, this month provides a perfect opportunity to discuss housing discrimination. This entry will explore the history that led to the ...
The meniscus is a commonly injured structure in the knee. The injury can occur in any age group. In younger people the meniscus is fairly tough and rubbery, and tears usually occur as a result of a fairly forceful twisting injury. In older people, the meniscus grows weaker with age, and meniscal tears may occur as a re...