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How It Works Now Cochlear implants are devices that are surgically implanted behind the ear in a way that bypasses the eardrum and middle ear completely to attach electrodes to the cochlea deep in the inner ear. A microphone is then attached outside of the ear in a way that looks very similar to a hearing aid. The diff...
Gliding flight is heavier-than-air flight without the use of thrust; the term volplaning also refers to this mode of flight in animals. It is employed by gliding animals and by aircraft such as gliders. This mode of flight involves flying a greater distance horizontally than vertically and therefore can be distinguishe...
Writing involves organisation of ideas into a structure, formulating complete sentences, using interesting vocabulary and applying genre specific language. By the time we are working on writing, children usually have a good grasp on spelling. Now we can use genres such as narratives and persuasive texts to teach studen...
In the wake of the SARS-CoV-2 pandemic, many questions about disease, sanitation, and vaccinations have emerged. A popular one out of the many is ‘how did bats cause the coronavirus?’ and the answer is that SARS-CoV-2 is a zoonotic disease that was transmitted to humans from bats. What is a zoonotic disease? A zoonotic...
GDP is the total value of all the goods and services produced in a country during a given period of time. It is often referred to as gross domestic product (GDP). To determine how much a country’s GDP has grown from one year to the next, we add up all the money spent on all goods and services in an economy during one y...
When a person has neuroticism, they are more likely to experience unpleasant emotions such as anger, anxiety, self-consciousness, irritability, emotional instability, or depression. In addition, those with high degrees of neuroticism have a poor response to environmental stress, perceive everyday events as dangerous, a...
Weather and Climate Data Exploration Students explore the relationship between weather and climate by graphing weather temperature data and comparing with climate averages. Students understand that weather is highly variable day-to-day, and climate is not. - Students explore weather and climate data by creating a graph...
The following account of Mexico’s traditional (folkloric) and introduced musical instruments consists of extracts from an article by Andrea Teter. Archaeologists have noted the existence of more than 1,400 musical instruments used in pre-Columbian Mexico and Central America. These were used primarily for religious, an...
How many of us have been formally trained to teach students living with adverse childhood experiences? When we ask this question throughout the U.S., few educators raise their hand. However, according to the National Survey of Children’s Health, almost half of all U.S. children have experienced one or more types of ser...
A volcano consists of a fissure or vent in the crust of the earth that allows magma to flow up from below. An open, active volcano will occasionally expel gas and magma through this vent, reducing the pressure in the magma chamber below. If something blocks this vent, however, it can lead to a spectacular eruption and ...
ᴀ ɴᴇᴛᴡᴏʀᴋ ᴏғ ʟᴀᴋᴇs ᴄᴏɴᴛᴀɪɴɪɴɢ ʟɪǫᴜɪᴅ ᴡᴀᴛᴇʀ ᴅɪsᴄᴏᴠᴇʀᴇᴅ ᴏɴ ᴍᴀʀs A network of lakes containing liquid water is hidden under ice at the south pole of a neighboring planet. Prior to new observations, astronomers believed that there was only a large salt lake on Mars. Now, it may be possible to find common life forms on the ...
Teaching kindness in the classroom is a critical aspect of modern education, as it helps students develop into well-rounded, compassionate individuals. Kindness education is not just about teaching students to be nice to one another, but about instilling in them the values and skills that are necessary for creating a m...
Patterns are made up of shapes such as spots, stripes, circles, and triangles. This new book explains how patterns in nature help camouflage animals or scare predators away! How does the bark of a tree feel? How is it different from a snake's skin? This engaging new book features close-up photos of different textures f...
Magna Carta is arguably the most famous medieval document. It sets out basic rights and liberties which are now considered fundamental in a just society. However, there is not only one version of Magna Carta, but 6 in total, issued by 3 different kings. 1215 Magna Carta First granted at Runnymede by King John in 1215 a...
What Is the Neutrality of Money? The neutrality of money, also called neutral money, is an economic theory stating that changes in the money supply only affect nominal variables and not real variables. In other words, the amount of money printed by the Federal Reserve (Fed) and central banks can impact prices and wages...
The 19th Amendment was ratified in 1920, but this landmark event was neither the beginning nor the end of the story for women and their struggle for the right to vote. Join us in 2020 as we commemorate this centennial year with 12 stories from our holdings for you to save, print, or share. March’s featured image shows ...
Botany is the study of plants. Plants are living things that grow in the ground and make their own food through a process called photosynthesis. Photosynthesis is when a plant takes in sunlight, water, and carbon dioxide and turns it into food for the plant. Plants come in many different shapes and sizes. Some plants h...
What Is the Conditional Perfect? In grammar, the conditional perfect is a verb form that describes something that might have happened in the past. It is the perfect or completed tense of the conditional mood. The conditional perfect only occurs in independent clauses and has two common uses. One refers to something tha...
The red dust cloud evolved as many planets in the solar system are heavy in this element, Mars, for instance. There are portions of the Earth that exhibit a red clay soil, Australia and the Southeastern US, but this is not a native soil as much as an accumulation of deposits. During the breakup of the Asteroid Belt, ma...
Geckos can regenerate tissue and heal without scarring, and Prof. Matt Vickaryous, Biomedical Sciences, wants to understand how they do it. Learning how geckos avoid scars and still heal rapidly without excessive fluid loss and infection could help researchers find ways to improve the healing process in humans. In the ...
Output is the result of a process in business like manufacturing or agriculture while outcome is the result of an event like an election or meeting.Both nouns may seem to be similar, but they differ in meaning. When to Use Output Output as a Noun Used in technical and business terms, there are at least three ways that ...
Tidal pressures exerted by a hot Jupiter may cause its host star to spin faster than it would without the planet. Because of its faster rotation, the host star may become more active and emit more X-rays, which are typical of young stars. A new study using NASA’s Chandra X-ray Observatory investigates whether “hot Jupi...
"The remains are highly evocative because they enable us to make almost face-to-face connection with animals that are tens of thousands of years old." A group of miners digging for gold in Canada hit an archaeological jackpot when they discovered two amazingly well-preserved ice age animals. According to a Yukon govern...
The technique works with multiple forms of graphene and is poised to become an important finding for the development of graphene electronics. The research appears in the June 11, 2010, issue of the journal Science. Scientists who work with nanocircuits are enthusiastic about graphene because electrons meet with less re...
The Mandan and Hidatsa people lived in villages of earthlodges. The earthlodge• Dome-shaped home made of logs and covered with willow branches, grass and earth • Used by Mandan, Hidatsa, and Arikara tribes was a dome-shaped home made of logs and covered with willow branches, grass, and earth. The women built, owned, an...
Girls in the eighteenth century were expected to learn household chores and the basics of reading, writing, and arithmetic. The girls in the Smith family of Braintree Massachusetts, however, gained more knowledge than many of their friends. While they learned to sew and cook from their mother, they also had access to t...
Good communication skills require speakers to use lexical and function words appropriately, according to the grammatical rules of the language (morphology, syntax, semantics). In addition, inserts appear to “grease the wheels of conversation” (Tottie, 1990:2) and contribute information about a speaker’s emotional state...
History is a subject that requires a lot of focus on the ability to evaluate and make clear decisions, based on the material, in KS4. The course allows us to understand the human condition in a modern context, reflecting on fascist movement and left wing revolutions, as well as the uncontrollable friction of the battle...
Algorithm and Robotics Algorithms enable Robots to learn and adapt to help completion of tasks. Massachusetts Institute of Technology (MIT) has devised an algorithm that enables a robot to quickly learn an individual’s preference for a certain task, and adapt accordingly to help complete the task. The group is using th...
By Annette Rey A difference exists between the words infer and imply. Labels of parts of speech can be confusing – transitive verb, intransitive verb, adjective, etc. – so I am doing away with those terms, and simply looking at how the words are used. The examples presented should be extremely helpful for polishing you...
Three Popular Data Displays This section elaborates on how to describe data. In particular, you will learn about the relative frequency histogram. Complete the exercises and check your answers. The stem and leaf diagram is not practical for large data sets, so we need a different, purely graphical way to represent data...
Strange life forms have been discovered deep beneath Antarctica, trapped beneath an ice shelf 260 kilometers (161 miles) from the open ocean. The creatures were discovered by the British Antarctic Survey during an attempt to gather a sediment core sample from under the ice shelf in the Filchner-Ronne Ice Shelf. While t...
A massive study of ancient and modern genomes stretching from Europe to Central and South Asia and spanning the last 8000 years paints a complex picture of prehistoric human migrations. The study, a herculean undertaking published in the journal Science and led by Vagheesh Narasimhan and colleagues at the Harvard Medic...
Before the tribes of Chickasaw and Choctaw were two different tribes, they were one entity. The tribe was split into two groups, each with their own leader. Chiksa' and Chahta were brothers and led the two groups. Before the split, the two groups experienced many years of war with a powerful enemy. The two brothers dec...
Thanksgiving can be a time of celebration, gratitude and sharing. It is also often a time when people assist the most vulnerable in our communities, through donations to food banks, volunteer service at missions and shelters, and similar acts of compassion coinciding with the start of a difficult cold season for those ...
In a two-dimensional plane, the area of a triangle is defined as the total space filled by its three sides. The area of a triangle is equal to half the product of its base and height, therefore A = 1/2 b h is the fundamental formula. This formula works for any triangle, whether it’s a scalene triangle, an isosceles tri...
died January 5, 1710/11, Wethersfield, Connecticut [U.S.] British American colonial author who wrote one of the first 17th-century captivity narratives, in which she told of her capture by Native Americans, revealing both elements of Native American life and of Puritan-Indian conflicts in early New England. Mary White ...
atomArticle Free Pass - Atomic model - Development of atomic theory - The atomic philosophy of the early Greeks - The emergence of experimental science - The beginnings of modern atomic theory - Studies of the properties of atoms - Models of atomic structure - Advances in nuclear and subatomic physics atom, smallest un...
The Step Pyramid at Saqqara is among the various architectural wonders of Egypt that attract tourists. It is the first pyramid built in Egypt in 2700 B.C. under the guidance of the famous architect, Imhotep. The tallest structure of its time, the building consists of King Djoser’s burial chamber and was built entirely ...
March 09, 2005 The evidence of the barren ground grizzly bear (Ursus arctos) was discovered on Melville Island, an uninhabited part of the western Arctic archipelago 1,500 kilometres due north of Yellowknife, and 1,000 kilometres north of the Arctic Circle. "We know grizzlies go out on the sea ice to hunt seals, but no...
Life on Earth is hurtling toward extinction levels comparable with those after the dinosaur-deleting asteroid impact of 65 million years ago, propelled forward by human activities, according to scientists from UC Berkeley. This week, scientists announced that if current extinction rates continue unabated, and vulnerabl...
Global warming — the steady increase in Earth’s air and ocean temperatures since the mid-20th century — is one of the most discussed and studied topics in the scientific community today. This kit introduces you to Earth’s climate and the issue of global warming with 23 hands-on experiments. Since Earth’s formation, its...
These four dwarf galaxies are part of a census of small galaxies in the tumultuous heart of the nearby Perseus galaxy cluster. The images, taken by NASA's Hubble Space Telescope, are evidence that the undisturbed galaxies are enshrouded by a "cushion" of dark matter, which protects them from their rough-and-tumble neig...
Division of whole Numbers is related to equal distribution of the objects in any number of parts. If done for smaller whole numbers, we can do it with repeated subtraction method. In the case of larger numbers, we need to use the method of Long Division, for which we need to remember the tables of the whole numbers. Th...
Nutrition for Diabetes Diabetes is a disease in which the body doesn't properly make or use insulin, a hormone necessary for keeping our blood sugar levels within a normal range. Over time, if diabetes goes untreated or is not well managed, high blood sugar levels may cause damage to the heart, kidneys, eyes, and/or ne...
Archaeologists have unearthed ancient stone engravings of vast animal traps in Jordan and Saudi Arabia that are possibly the earliest “blueprints” ever discovered. The engravings, estimated to be about 7,000 to 8,000 years old, are precise plans for nearby structures archaeologists call “desert kites”—converging lines ...
Evidence that the global climate is changing is now unequivocal, but what these changes mean for regional and local weather events, both now and in the future, remains uncertain. Today climateprediction.net, the world's largest climate forecasting experiment, and the Met Office launch a new international project called...
In most history books, Christopher Columbus is credited with discovering America, hence the observance of Columbus Day. But FSU professor Gary Taylor has taken Columbus' achievement a step further, contending Columbus also discovered the concept of race. Taylor says, "Not on Columbus' first voyage, but his third voyage...
The UK, US and Russia have all been trying to reach these subglacial lakes, in something akin to the space race, as previously reported by Humans Invent. Last year the British Antarctic Survey had been attempting to reach Lake Ellsworth, 3km below the ice in West Antarctica but were forced to abandon the project on Chr...
Learning music by ear Learning music by ear is done by repeatedly listening to other musicians and then attempting to recreate what one hears. This is how people learn music in any musical tradition in which there is no complete musical notation. Many people in cultures which have notation still learn by ear and ear tr...
Graph paper can be used to work through Problems C1-C9. If using the spreadsheet program to create the graphs, only use the data for the first six figures (or fill in the in-between entries in the table). Large jumps in inputs cause the spreadsheet graphs to distort and look less like parabolas. Since there are only a ...
Our universe, from the stars in the sky to the pixels making up this text, is made of tiny particles. In high school, one learns of the atom, the bottommost level of matter, and its components, the proton, neutron, and electron. However, this is not all there is to the universe. There are many other types of particles ...
On this July 4th week, U.S. beachgoers are thronging their way to seaside resorts and parks to celebrate with holiday fireworks. Across the horizon and miles out to sea toward the north, the Atlantic Ocean's own spring and summer ritual is unfolding: the blooming of countless microscopic plant plankton, or phytoplankto...
The earth was still in the process of change as the Early Cretaceous began. The land masses were drifting and the climates were changing. These changes affected the plant and animal worlds. Dinosaurs were becoming more plentiful and many more types were evolving. Some of the more fanciful dinosaurs with unusual crests ...
Sexual reproduction in flowering plants is often mediated by the birds & the bees (& other animal agents), but up until now the life cycle has appeared much simpler in plants like the mosses. Until fairly recently it was generally accepted that moss sex was a case of ‘just add water’: this released sperm from the male ...
What Does Autism Mean? People usually call it autism (say: AW-tih-zum), but the official name is autism spectrum disorders. Why? Because doctors include autism in a group of problems that kids can have, including Asperger syndrome and others. These problems happen when the brain develops differently and has trouble wit...
The throat (pharynx) is located behind the mouth, below the nasal cavity, and above the hollow tube that leads from the throat to the stomach (esophagus) and windpipe (trachea). It consists of an upper part (nasopharynx), a middle part (oropharynx), and a lower part (hypopharynx). The throat is a muscular passageway th...
KU Constitution Day Celebration Constitutional Amendments, An Overview After ratification of the Constitution, the anti-Federalists continued to voice their concerns over the powers of the federal government. In the course of the states' ratification debates over the Constitution, states had recommended over two hundre...
NOAA Scientists Find Tsunami “Shadow” Visible From Space Editor's Note: Promising news, anything we can do to improve our prediction of violent weather situations is always useful.For the first time, NOAA scientists have demonstrated that tsunamis in the open ocean can change sea surface texture in a way that can be me...
As we have seen, the integrated dynamic height above a reference level is closely related to the horizontal pressure gradient force. It is for that reason also closely related to the geostrophic flow, or the flow that results from the balance between the horizontal pressure gradient and the Coriolis force. In the north...
Smallpox is a contagious, disfiguring and often deadly disease that has affected humans for thousands of years. Naturally occurring smallpox was eradicated worldwide by 1980 — the result of an unprecedented global immunization campaign. Stockpiles of smallpox virus have been kept for research purposes. This has led to ...
ALMA Reveals Nearby Planetary System This view shows a new picture of the dust ring around the bright star Fomalhaut from the Atacama Large Millimeter/submillimeter Array (ALMA). The underlying blue picture shows an earlier picture obtained by the NASA/ESA Hubble Space Telescope. The new ALMA image has given astronomer...
Living in Missouri, family vacations often took us out west to Colorado and other Rocky Mountain states. After a long, flat drive across Kansas and almost half of Colorado, the Rockies–– almost without warning––pop out of the ground. I still remember the stark contrast of the majestic peaks against the spacious plains....
We are a step closer to understanding how life began, and we can thank the humble lemon. For the first time, genetic information has been copied inside a simple cell designed to mimic primordial life. Until now, such copying had the unfortunate side effect of destroying the cell, but researchers have found that the cel...
- 10 to 20 minutes Problem-solving is an excellent way to teach the experience of kindness to others. You can do this by posing hypothetical situations and thinking of alternatives for good endings. For example, you could say: "Let's pretend that I just got home from work, and while I was cooking dinner the phone rang....
WIKIMEDIA, MOSTAFA FATEHIAs research surfaces supporting the role of beneficial bacteria in human health, immunity, and normal childhood development, some scientists are beginning to look at even smaller biological entities in our gut. In a study published today (May 2) in Proceedings of the National Academy of Science...
Can you listen to a phone message in one ear while a friend talks into the other? If you can, it may be thanks to your genes, scientists report. Your brain analyzes the sounds you hear so you can make sense of them. This “auditory processing” helps you decide whether a sound is a voice you should listen to or backgroun...
How do you bake bread? Everybody enjoys the smell and taste of freshly-baked bread. It is light and fluffy as a result of the action of yeast on sugar. The yeast converts the sugar to carbon dioxide, which at high temperatures causes the dough to expand. The end-result is an enjoyable treat, especially when covered wit...
The Systems of the Body The Reproductive System Back to the Basics - Our Body by Margueritte Gilkey, MD September 2010 The purpose of the reproductive system is to create human beings. Both men and women have reproductive systems, and as we all know, both play a role in the reproductive process. The Female Reproductive...
Capacitors are reactive elements, which make them suitable for use in analog electronic filters. The reason for this is that the impedance of a capacitor is a function of frequency, as explained in the article about impedance and reactance. This means that the effect of a capacitor on a signal is frequency-dependent, a...
Name: Jesse R. Why do trees have many small leaves instead of fewer Some kinds of trees have large leaves, and other kinds of trees have small leaves. Some trees that grow in wet places and others that grow in the tropical rainforests have very large leaves. Other trees that grow in dry places, especially on mountain s...
This beautiful visualization simulates global wind patterns, including jet streams in the Northern and Southern hemispheres, as well as individual tropical cyclones. It was produced by a system of integrated models, called GEOS-5, run on a NASA supercomputer. Click on the image to get a bigger view and look in particul...
Estimating with Fractions NYS Mathematics, Science, and Technology Learning Standard 1: Students will use mathematical analysis, scientific inquiry, and engineering de sign , as appropriate, to pose questions, seek answers, and develop Standard 3: Students will understand mathematics and become mathematically confident...
The U. S Constitution was written in the same Pennsylvania State House where the Declaration of Independence was signed and where George Washington received his commission as Commander of the Continental Army. Now called Independence Hall, the building still stands today on Independence Mall in Philadelphia, directly a...
The German army developed the V-2, known also as the A4 missile, as an alternative to super-long-range artillery, which the Treaty of Versailles prohibited after World War I. Designed by rocket pioneer Wernher von Braun, the V-2 was a breakthrough in missile technology but failed to prevent Germany's defeat in World Wa...
What is early literacy? Early literacy is what children know about reading and writing before they can read and write. Babies chew on board books. Toddlers learn which way to turn the pages and hold the book. Preschoolers discover that adults are not reading the pictures, but the words on the pages. All of these are ex...
Minerals possess many properties. Color is usually the first and most easily observed. For many minerals, color is a reliable diagnostic property used for identification. For others, it is the most variable and unreliable property. But what causes color in minerals? This is something that was debated among geologists f...
This 32-page curriculum guide is designed for use with the authors' picture book for young readers, Woodrow for President. It offers teachers an opportunity to expand and deepen student learning in many areas of citizenship--voting, political parties, campaigns, primaries, elections and civic volunteerism. Activities a...
HistoryForeign Influence and Settlement (For early history of West Malaysia, see Malay Peninsula; for history of East Malaysia, see Sabah and Sarawak.) When the Portuguese captured Malacca (1511), its sultan fled first to Pahang and then to Johor and the Riau Archipelago. One of his sons became the first sultan of Pera...
animal learningArticle Free Pass - The general nature of learning - Types of learning - Simple nonassociative learning - Associative learning: conditioning - Spatial learning - Perceptual learning - Complex problem solving The ability to speak was regarded by Descartes as the single most important distinction between h...
tomb, © paul prescott/Shutterstock.com in the strictest sense, a home or house for the dead; the term is applied loosely to all kinds of graves, funerary monuments, and memorials. In many primitive cultures the dead were buried in their own houses, and the tomb form may have developed out of this practice, as a reprodu...
Flash PatternsThe function of lighthouses is not just to warn sailors of a potentialdanger. They also enable them to find their position. This is doneby not only making sure that the projected beam is highly visiblebut also making it distinct from any other lighthouse beam. Stripesor bands are sometimes painted on the ...
Awards & Honors Edward L. Tatum 1958 Nobel Prize in Physiology or Medicine Beyond the passing down of green eyes, long limbs or a talent for music, science has understood since the turn of the 20th century that even a person's biochemistry is inheritable. But exactly how genes work, the key to the next stage of genetic...
On December 1, 1955, Rosa Parks refused to move to the back of a bus in Montgomery, Alabama. But on July 6, 1944, Lieutenant Jack Roosevelt (“Jackie”) Robinson also refused to move to the back of the bus, and he received a court martial. Jackie Robinson, later to become famous as the first black to integrate major leag...
The rocks beneath the South China Sea may reveal how oceans first formed and yield millions of years of climate history, says geologist Jian Lin You are co-lead of an international project to drill for rock samples in the South China Sea. Why is that sea bed of such interest? We want to answer questions about when it w...
Last week I posed a couple of questions about the Common Core standard CCSS.ELA-Literacy.RST.6-8.1 Cite specific textual evidence to support analysis of science and technical texts. The first question was What is this standard asking of a student? My response would be that students would need to identify evidence withi...
For conservation biologists, remote regions that have seen little human impact pose a dilemma. Such areas generally have the most intact wildlife, and therefore they are often the target of conservation efforts and research. Yet because they haven’t been extensively populated or paved, such areas haven’t usually been m...
Researchers in the grasslands of South Sudan were taken by surprise when they first spotted a beautifully patterned bat with pale yellow spots and stripes on dark black fur. DeeAnn Reeder, an associate professor of biology at Bucknell University, and Adrian Garside, a program officer from the conservation group Fauna &...
This is a replica of the Congreve 32-pounder war rocket, a gunpowder-propelled war rocket of the early 19th century. The rocket was developed by the Englishman, William Congreve. The specimen shown here is of the central stick mounted pattern with an explosive warhead. Incendiary warheads could also be attached. The ma...
A relatively small number of American Indians in Minnesota are Sioux compared to the Chippewa. Their reservations are located in southern Minnesota, and include the Lower Sioux, Prairie Island, Shakopee Mdewakanton, and Upper Sioux Reservations. Prior to 1600, the Sioux inhabited much of Minnesota and were later forced...
Oral Allergy Syndrome (OAS), a type of food allergy, is an allergic reaction that is confined to the lips, mouth and throat. Oral allergy syndrome is due to a cross-reactivity between plant proteins from pollen and fruits or vegetables. When a child or adult with pollen allergy eats a fresh fruit or vegetable, the immu...
Role of the Philosophers in the French Revolution France in the 18th century had many revolutionary thinkers. Among them were Voltaire, Rousseau, Montesquieu and Diderot. Their revolutionary ideas encouraged people to fight for their rights. They exposed the inefficiency of the monarch and his government and aroused th...
The following article was first published in the ISGS Quarterly, Volume 36, Number 1, pp. 9-25, Spring 2004. Riding the Contraband Train Being Black in Illinois during the early years of the 19th century was not a pleasant experience. In 1767 when the Penns and the Baltimores couldn't resolve their colonial border disp...
In chemistry, yield, also referred to as reaction yield, is the amount of product obtained in a chemical reaction. The absolute yield can be given as the weight in grams or in moles (molar yield). The percentage yield (or fractional yield or relative yield), which serves to measure the effectiveness of a synthetic proc...
Utah History Encyclopedia The Uinta Basin and Mountains are located in the northeast corner of the state and are part of a larger physiographic area known as the Colorado Plateau Province. The Uinta Mountains, a folded and faulted anticlinorium (a succession of geological anticlines and synclines), are 150 miles long a...
Chpt 2 - Radio & Signal Fundamentals This is the real beginning of your Amateur Radio Adventure! In this chapter, we dive into what makes a radio work - the "radio" and "signals." The material in this chapter is presented in a "here's what you need to know" style. References will be provided so that you can learn more ...
Common assignment operators for languages include =, ==, and :=. An assignment operator allows you to assign a value to a variable. The value can be a literal value like "Mike" or 42 or the value stored in another variable or returned by a function. When comparing floating point numbers, make sure you round to an accep...
Gastroesophageal reflux disease, or GERD, occurs when stomach acid flows upward into the esophagus. GERD can be aggravated by a number of different factors, including a hiatal hernia, a condition that occurs when part of the stomach slides into the chest through the hiatus, an opening in the diaphragm. The diaphragm it...
news & tips A collection of helpful articles on teachers and teaching “Flipped” Classrooms: How Do They Work? In 2007, Jonathan Bergman and Aaron Sams, teachers at Woodland Park High School in Woodland Park, Colorado, came up with the idea of using PowerPoint to record their classroom lectures and post them online for ...
Every presidential election year in the United States, political party members have the opportunity to nominate the candidate or candidates they believe are most electable in a general election held in November. Some states hold primary elections on predetermined dates, while others, most notably Iowa, hold special ele...

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