My Science School

Mona Lisa is known for her inscrutable smile, but there’s another Leonardo da Vinci’s masterpiece which is equally intriguing. The Salvator Mundi is the world’s most expensive artwork. In 2017, it was sold for a record $450m at auction by Christie’s in New York. After that, the location of the painting was kept secret. Many people speculated about its location, but were unable to find it. On June 2019, Artnet, an art industry news service disclosed the mysterious hideout of the painting. According to the news service, the 500-year-old painting was being kept on Prince Mohammed’s yacht, Serene!

The fact that Salvator Mundi was the last work by da Vinci in private hands therefore makes it an extremely enticing prospect for any private collector looking to own a serious piece of art history.

There’s been some debate in the art world as to whether the da Vinci painting is really by the master himself. Some think it’s a fake, whilst some think that extensive restoration work on the painting interferes with the ability to attribute it to da Vinci. Christie’s say that scholars agree that is authentic and its finding in 2005 is “the greatest artistic rediscovery of the 20th century.”

 

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Livestock is farmed chiefly to supply foods such as meat, eggs and milk, but also for leather, fur and wool. Animal by-products may also include glue, gelatin and fertilizer.

The term “livestock” refers to any domesticated, land-living animal that is raised to provide resources like meat, milk, eggs, and feathers, or to provide services like transportation or cultivation assistance. Buffalo, cows, ducks, goats, and horses are just a few examples of animals that fall into this broad category.

Livestock are raised around the globe, both on small scales—generally for subsistence or local trade—and in massive industrial operations supplying international markets. The sheer mass of these animals is hard to fathom: The combined weight of cattle, chickens, and pigs exceeds the weight of all wild animals and humans combined.

22.8 billion Chickens

Chickens are far and away the most numerous type of livestock on the planet. There are about 135 chickens for every cow—and three for every human.

Wild chickens are believed to have originated in northern China, and were eventually domesticated in Southeast Asia more than 5,000 years ago. China remains the world's leading producer of chickens, claiming over 20 percent of the global chicken supply. However, the birds are now raised on every continent except Antarctica, where they are banned. Globally, chicken consumption is on the rise, outpacing the growth in consumption of other meats, like beef or pork. But growing demand for eggs has also contributed to chickens' dominance.

1.5 billion Cattle

Cattle are the second most common livestock animal. Their domestication is thought to have occurred roughly 10,500 years ago, in what is now considered the Middle East.

Today, these animals are especially prevalent in South America, where they're primarily raised for meat, and in India, where the animals are conversely valued for the dairy products they produce. Cows are revered in Hinduism, India's majority religion, and most Indian states have regulation prohibiting, or at least regulating, the slaughter of cattle.

1.2 billion Sheep

Sheep are believed to be one of the first domesticated animals, and are common throughout the Old World. They're especially prevalent in northeastern China, Central Asia, and North Africa, but are also raised intensively in New Zealand and Australia.

Although New Zealand is famous for having more resident sheep than people (with roughly six sheep for every person), it actually ranks third in terms of sheep per capita. Mongolia has a 10:1 ratio of sheep to humans, while the Falkland Islands, a British territory off the eastern coast of Argentina, boast more than 200 sheep per capita.

967 million pigs 

The sixth most common livestock animal is the humble pig, which is descended from the significantly more formidable wild boar. Pig production is localized to a few high-intensity areas in China, northern Europe, and the American Midwest. Nearly half of the world's pigs are raised in China alone.

Excluding areas where pork is not customarily consumed—including North Africa, the Middle East, and other predominately Muslim regions—pig production is on the rise.

From 1960 to 2010, the number of pigs on the planet grew by 250 percent, while the size of individual pigs nearly doubled. This growth is attributed to increased demand for animal protein in the regions where pigs are already consumed.

A newly identified portrait of Leonardo Da Vinci, was displayed in London as the world marked the 500th anniversary of the death of the artist and inventor.

The sketch was made by an unidentified assistant shortly before the master’s death in 1519. Only one other portrait has survived from the artist’s lifetime, aside from self-portraits.

The film, like the book, was considered controversial. It was met with especially harsh criticism by the Catholic Church for the accusation that it is behind a two-thousand-year-old cover-up concerning what the Holy Grail really is and the concept that Jesus Christ and Mary Magdalene were married and that the union produced a daughter, as well as its treatment of the organizations Priory of Sion and Opus Dei. Many members urged the laity to boycott the film. In the book, Dan Brown states that the Priory of Sion and "all descriptions of artwork, architecture, documents and secret rituals in this novel are accurate."

The film grossed $224 million in its worldwide opening weekend and a total of $758 million worldwide, becoming the second-highest-grossing film of 2006, as well as Howard’s highest-grossing film to date. However, the film received generally negative reviews from critics. It was followed by two sequels, Angels & Demons (2009) and Inferno (2016).

 

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In Europe in the Middle Ages, large fields were often divided into strips, with individuals farming their strip as intensively as possible. Since little was under-stood about the nutrients that plants need and the use of fertilizers, the soil in these strips soon became exhausted, with poorer and poorer yields resulting. The Agricultural Revolution was a change in farming practice that took place gradually during the eighteenth century. The technique of resting ground for a year (leaving it fallow) and rotating crops, so that the same crop was not grown year after year on the same plot, was tested and found to improve harvests. A two-year rotation and later three- and four-year rotations came to be widely practiced.

The Agricultural Revolution was a major event in world history and had a profound effect on populations throughout Europe and other historical events.  For example, many historians consider the Agricultural Revolution to be a major cause of the Industrial Revolution, especially in terms of when and how it began in Britain.  For example, the Industrial Revolution began in Britain in the 18th century due in part to an increase in food production, which was the key outcome of the Agricultural Revolution.  As such, the Agricultural Revolution is considered to have begun in the 17th century and continued throughout the centuries that followed, alongside the Industrial Revolution.

In the centuries before the start of the Agricultural Revolution, European farmers practised a form of farming in which they planted the same crop in the same field every year.  This would cause them to have to not plant anything in the field every few years in order to avoid destroying the quality of the soil.  However, Charles Townshend, a British statesman, identified a way to improve farming practises and thus produce more food.  In the 1730s, he discovered that by growing different types of crops in the fields year after year, British farmers did not have to leave a field for a growing season.  For example, he argued that in one year the farmers should grow a cereal grain such as whet or barley and in a following year they should grow a vegetable crop such as turnips.  By doing so, a farmer could grow food in a field every year without diminishing the ability of the soil.  For his discovery, he became known as ‘Turnip Townshend’.  In general, this allowed British farmers to grow more food, which in turn helped lead to an increase in the population of British citizens.  The increased population was important to the beginning of the Industrial Revolution because it created a large workforce for the factories and mines that would be common during the time.

A key aspect of the Industrial Revolution was the invention of different types of machines, many of which were used in farming and agriculture.  For example, Jethro Tull is famous for his invention of the seed drill which had a profound effect on the Agricultural Revolution and, in turn, the Industrial Revolution.  Tull worked on his father’s farm in England and noticed that some of the traditional farming practices were very inefficient.  For example, he was particularly concerned with how seeds were drilled into the soil by hand, which was very slow and required a lot of labor on the part of farmers. As a result, Tull invented a seed drill with a rotating cylinder to drill the seeds into the soil. This made the planting process much quicker.  As well, the seed drill allowed crops to be planted in straight rows, which allowed the farmers to use less seeds while making weeding of the crops easier and more efficient.

If the 2000s were about Harry Potter, then the 2010s were all about the Marvel Cinematic Universe (MCU). The MCU, which includes 22 films, beginning with 2008’s Iron Man, became the most successful film franchise of all time, making more than $18.2bn to date.

Avengers: Endgame, released on April 26, 2019, spelt the end of phase three of the MCU and the infinitely Saga. There was so much buzz around the film that multiplexes held special early-morning and post-midnight screenings, which ran to packed houses.

Endgame made an estimated $1.19 million at the domestic box office this weekend to push its total worldwide tally to $2.79 billion. Avatar’s haul stands at $2.789 billion. The record is the newest jewel in Marvel’s crown — or Infinity Stone in its gauntlet, if we want to stay on theme with the Marvel cinematic mythology. When the movie came out in April, it set the record ($1.2 billion) for the biggest worldwide opening weekend in history and the biggest domestic opening weekend in history; it also holds the fastest-to-$1 billion title (it only took five days).

 

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Not all crops are grown for human or animal food. Cotton, flax and jute are grown to be made into fabric. Esparto grass may be cultivated for the manufacture of rope and paper. Tobacco is grown for smoking, while bamboo canes have hundreds of varied uses.

Other non-food crops, such as lavender, are grown for the perfume and cosmetics industries.

Castor: In 1960s, more than 20,000 acres were grown around Lubbock and processed in oil mills. Today there is no commercial production due to cheaper imports but there are some reports of 10 acres for planting seed. Castor produces a high quality oil used in industrial equipment, paints, aircraft and space lubricants, and other uses; less than 1% is fed to youth as a laxative. Seed contains ricinine which is highly toxic if eaten. Castor is now on the Homeland Security biohazard list after years of open production in the U.S.

Christmas trees: Planted on 1,500 acres, 90% are east of I-35 and on sandy soils; 70% are Virginia pine, 20% Afghan pine, and 5% Layland cypress. Seedlings planted, frequently drip irrigated to assure summer growth; requires good weed control to get bottom limb growth. Pruning and shaping essential for market-ability. Pines may be sprayed with a dye for more intense green coloration. Usually harvested after 5 years, with gross sales of $10,000 per harvested acre (average of $2,000 per planted acre if sequential plantings). No major disease problems but pine tip moth requires treatment every year and aphids in some years. Most tree farms are near metro centers for seasonal marketing and family experiences.

Flax: No flax is raised today but prior to 1970, flax was grown on 40,000 acres in South Texas. Winter-hardy varieties were short-strawed to maximize seed yields for production of linseed oil, an unsaturated oil used in paints. Flax, a winter annual, was cultured similar to small grains, seed was sold through a cooperative at Karnes City and shipped north. Some flax straw was baled for paper but the last unsold large supply mysteriously caught fire. Fiber varieties are typically taller but not raised in Texas.

Guayule: This North American crop was grown on 30,000 acres during World War II to supply natural rubber. This slow growing perennial does well in desert areas. Small experimental/observation plots with Firestone near Fort Stockton. In AZ, Yulex, Inc. has planted 500 acres in a quest to produce a natural latex for high-end medical and surgical products with non-allergenic properties. Yields average 1,000 pounds of guayule rubber per acre worth 40 cents per pound. In AZ, a pilot plant is designed to handle 750 tons of biomass in anticipation of producing natural latex; if successful, then plans to expand production to NM and TX.

Hemp/Marijuana: Originally an important cordage crop, raised for fiber in early days for burlap bags used for shipping. Now grown for seed and leaves for narcotic resin from Cannabis in small hidden plots of 0.1 to 0.5 acres in secluded areas along creek banks. Larger plots (5 acres or more) may be hidden if by tall crops such as forests or corn. While no firm statistics are available on the acreage producers, estimates range from 1,000 to 2,800 acres, with 80% of the production east of I-35 and remainder within 80 miles of metro centers, such as Austin. The real weeds are controlled by hand hoeing and selective herbicides but no pesticides are labeled. Diseases include Fusarium wilt and bacterial leaf diseases. In many states “medicinal hemp” sales exceed those of any other crop.

Kenaf: A new alterative crop was evaluated in LRGV without economic success. Some acres still maintained for seed production. Some production in Mississippi for newspaper fiber. Crop is desiccated by frost; chopped material stored in modules before processing. Few pests but potential concerns for white fly, powdery mildew, leaf spot, cotton root rot, and leaf deformation.

Lesquerella: A perennial shrub-like plant common in the desert, selected and cultivated for production of high quality industrial oil, similar to castor, with on-going research at Pecos, TX and AZ. No commercial production in Texas but 50 acres are planted for research in cooperation with AZ. Irrigated production usually yields 1,800 pounds of seed per acre; would require a price of 15 to 20 cents/pound to be profitable. Produces best if fall-planted, irrigated, and level ground for combine harvesting. Meal may be fed to livestock after oil is extracted.

Although there are thousands of edible plant species, only a relatively small number have been domesticated, i.e. converted to widespread usage by humans. Three crops—wheat, corn, and rice—provide nearly 60 percent of total plant calories that humans consume. Other major crops include potatoes, soybeans, cassava, sorghum, and legumes. The three top crops are grown worldwide, though certain regions are known for specific crops. For example, the United States supplies almost half of the world’s 800 million tons of corn annually, followed by China, Brazil, and Mexico. China, India, and the U.S. are the largest wheat producers, and almost 95 percent of all rice is grown in Asia. And, while 16 percent of total wheat production reaches the world’s markets, rice is primarily consumed where it is grown and only 5 percent makes it to the world market.

Wheat is one of the oldest cultivated crops, beginning around 10,000 years ago in the area known today as the “Fertile Crescent” between the Tigris and Euphrates rivers. Evidence suggests that wheat was used for making bread in Egypt by 5000 BC and its cultivation had spread to Europe by 4000 BC. Although the U.S. is the third largest wheat producer in the world, large-scale cultivation did not begin until the late 1800s when European settlement moved into the central plains. Today, approximately 700 million tons of wheat are grown annually around the world.

Rice continues to be a critical staple for nearly half of the world’s population, and for whom rice cultivation is the sole or primary source of food. Although rice is a good carbohydrate source, it does not provide adequate nutrition—an issue of increasing concern in the developing world where almost three billion people obtain most of their daily nutrients from rice. These populations can suffer from micronutrient deficiencies, most notably a lack of vitamin A.

Corn (or maize) is thought to be a domesticated version of the wild cereal grass teosinte, and was likely cultivated between three and four thousand years ago in Mesoamerica. It is still one of the most common crops grown in the Americas. Only about one percent of the corn that is grown is eaten as whole or processed grain (sweet corn, corn chips, or tamales); more than 50 percent is used as animal feed—primarily for cattle, hogs, and chickens—and the remainder is consumed either as starch or in the form of corn sweeteners. More recently, an increasing amount of land area has been dedicated to growing corn due to the demand for ethanol, a corn-based fuel. In 2007, ethanol production became the second largest use of corn grown in the U.S. The sustainability of this use is controversial.

Arable farming is the growing and harvesting of crops, particularly where the ground is ploughed between harvests, as the term comes from the Latin word for ploughing. Arable farming is of enormous importance to the world's population, since most of us rely on grains or vegetables for our staple foods.

Arable farming means growing crops in fields, which have usually been ploughed before planting. Arable crops are generally annual – they need to be replanted each year.

Land is cultivated (prepared by ploughing) in autumn or spring, and the crop is planted. It grows through the spring and summer, and is harvested in late summer or autumn. The land is then cultivated again for another crop or returned to pasture for one or more years.

Cereal farming requires vast cultivable expanses, a significant labour force and appropriate tools. This method of farming is nonetheless similar to that of market gardening. Ploughing, sowing, fertilising, irrigating and treating are steps that have been followed for thousands of years to ensure an adequate yield and an abundant harvest. Arable farming in industrialised countries now relies on a variety of specialist mechanical devices.

From sowing to harvesting, intensive cereal farming follows a similar chain of events to market gardening, only on a larger scale. Current cereal crops are mostly grown in open fields, whereas tubers, such as potatoes, can also be grown in greenhouses. Both practices require a lot of space and tools, as well as a sizeable workforce. A feature of cereal farming is that it varies according to specific type of soil and way of farming each cereal needs.

The first stage in cereal and tuber cultivation is ploughing. This involves turning the soil over to aerate it, removing residue from former crops and digging furrows. With intensive farming, chemical fertilizers are then applied to the newly ploughed soil, whereas extensive farming relies on the soil’s natural resources and alternates crops on a yearly basis.

Early missionaries were the first to grow wheat and oats in New Zealand. In the first half of the 19th century some North Island M?ori communities grew wheat, which they sold to settlers, exported to Sydney, or used themselves.

New Zealand Company settlements, such as Wellington, Nelson and Whanganui, were intended to be based on arable production rather than animal farming. However, at that stage there was a limited export market for crops, but a huge market for animal products – initially for wool and later for meat and dairy production. Cropping remained important in some areas, particularly the Canterbury Plains and North Otago, where summer conditions were ideal for maturing grain crops.

A generator is a machine that produces electrical current by moving a wire in a magnetic field. Energy is needed to move the wire. This may come from steam, wind, moving water, or, in the case of the small generator called a dynamo that may be found on some bicycles, from the movement of human legs! Dynamos produce just enough electrical energy to power the lights of a bicycle, but this energy is not stored. If the cyclist stops pedaling, the lights dim and go out.

The windmills of a wind farm can power generators to produce electricity for hundreds of homes.

Electric Generator also called dynamo, any machine that converts mechanical energy to electricity for transmission and distribution over power lines to domestic, commercial, and industrial customers. Generators also produce the electrical power required for automobiles, aircraft, ships, and trains.

The mechanical power for an electric generator is usually obtained from a rotating shaft and is equal to the shaft torque multiplied by the rotational, or angular, velocity. The mechanical power may come from a number of sources: hydraulic turbines at dams or waterfalls; wind turbines; steam turbines using steam produced with heat from the combustion of fossil fuels or from nuclear fission; gas turbines burning gas directly in the turbine; or gasoline and diesel engines. The construction and the speed of the generator may vary considerably depending on the characteristics of the mechanical prime mover.

Nearly all generators used to supply electric power networks generate alternating current, which reverses polarity at a fixed frequency (usually 50 or 60 cycles, or double reversals, per second). Since a number of generators are connected into a power network, they must operate at the same frequency for simultaneous generation. They are therefore known as synchronous generators or, in some contexts, alternators.

Electrically powered vehicles have been in use for many years! Powering motor cars with electricity does present certain problems, as batteries are heavy and a car’s energy requirement is high. This means that the distance an electric car can travel before it is recharged may be too low for many uses. In hot countries, engineers have experimented quite successfully with supplementing a car’s battery power with solar power, using solar panels on the roof of the car.

Where vehicles can obtain electrical energy from a fixed wire or track, there is no problem about electrical supply. Electrically powered trains, such s the French train are the fastest in the world.

A battery electric vehicle (BEV), pure electric vehicle, only-electric vehicle or all-electric vehicle is a type of electric vehicle (EV) that exclusively uses chemical energy stored in rechargeable battery packs, with no secondary source of propulsion (e.g. hydrogen fuel cell, internal combustion engine, etc.). BEVs use electric motors and motor controllers instead of internal combustion engines for propulsion. They derive all power from battery packs and thus have no internal combustion engine, fuel cell, or fuel tank. BEVs include – but are not limited to – motorcycles, bicycles, scooters, skateboards, railcars, watercraft, forklifts, buses, trucks, and cars.

In 2016 there were 210 million electric bikes worldwide used daily. Cumulative global sales of highway-capable light-duty pure electric car vehicles passed the one million unit milestone in September 2016. As of the end of 2019, the world’s top selling highway legal all-electric car in history is the Nissan Leaf with global sales of 450,000 units, followed very closely by the Tesla Model 3 with 448,634 sales.

Inside many electric light bulbs is a wire called a filament, made of tungsten. When current is passed through the wire, it glows white hot, giving off light and some heat. As the oxygen has been removed from the bulb, combustion cannot take place, so the wire does not bum out immediately.

Electricity flows through a thin tungsten wire in the light bulb called the filament. The filament used in a bulb has a property called "resistance." Resistance is the amount of friction that an object will put against electricity flowing through it. A filament has a lot of resistance to electricity. As a result of this resistance, the filament heat up and start glowing, converting electrical energy to light energy. This is because of the Joule-effect, which means that resistances heat up when an electrical current runs through them. This produces light and heat illuminating its surroundings.

The brightness of the filament can be varied by changing the amount of current flowing through it (the amperage), or the voltage between ends, as the amperage is related to the voltage by Ohm's law. Also, as the filament ages, its brightness will diminish somewhat and its light will get redder and redder. Eventually, all filaments will slowly vaporize and fail due to the high temperature caused by the electricity flowing through it.

By design, a light bulb has no oxygen in it. The manufacturer fills it with an inert gas like argon or nitrogen. However, this does not prevent atoms from popping off the surface of the filament due to the intense heat. This makes the filament thinner and thinner. Eventually, it becomes so thin that it breaks. For a short period of time, the two broken ends are very close to each other, and electricity can jump across in a bright blue spark. However, the two broken ends soon fall away from each other, breaking the spark, and the bulb will light no more.

Light bulbs themselves, if used properly, are not dangerous. Although their primary function is to produce light energy, as a side effect they also produce heat.

Light bulbs are sold according to the number of watts they use - the higher the number, the brighter the bulb is, and the more energy it uses. Despite getting hot, light bulbs don't explode. However, the outer glass of a light bulb which has been on for some time is quite hot, and can cause minor burns, or the broken edges might cut the skin.

Fleming’s right-hand rule enables you to tell in which direction a current flow in a wire that is moved in a magnetic field. Hold your hand as shown and point your thumb, in the direction of motion and your first finger in the direction of the magnetic field. Your second finger will then point in the direction in which current flows in the wire.

Physicists use a hand mnemonic known as the right-hand rule to help remember the direction of magnetic forces. To form the mnemonic, first make an L-shape with the thumb and first two fingers of your right hand. Then, point your middle finger perpendicular to your thumb and index finger.

The right-hand rule is based on the underlying physics that relates magnetic fields and the forces that they exert on moving charges—it just represents an easy way for physicists to remember the directions that things are supposed to point. Occasionally a physicist will accidentally use their left hand, causing them to predict that the magnetic force will point in a direction opposite the true direction!

Moving charges

When charges are sitting still, they are unaffected by magnetic fields, but as soon as they start to move, the magnetic field pushes on them. But, the direction in which the field pushes on charges is not the same as the direction of the magnetic field lines.

We can remember this diagram using the right-hand rule. If you point your pointer finger in the direction the positive charge is moving, and then your middle finger in the direction of the magnetic field, your thumb points in the direction of the magnetic force pushing on the moving charge. When you’re dealing with negative charges—like moving electrons—the force points in the opposite direction as your thumb.

Fleming’s left-hand rule enables you to use your hand to work out the direction of motion of a current-carrying wire in a magnetic field. Hold your hand as in the picture, with the first finger pointing in the direction of the magnetic field and your second finger in the direction of the electric current. Your thumb will now point in the direction of motion of the wire.

Fleming's left-hand rule for electric motors is one of a pair of visual mnemonics, the other being Fleming’s right-hand rule (for generators). They were originated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor, or the direction of electric current in an electric generator.

Whenever a current carrying conductor comes under a magnetic field, there will be force acting on the conductor. The direction of this force can be found using Fleming’s Left Hand Rule (also known as ‘Fleming’s left-hand rule for motors’).

Similarly if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. The direction of this force can be found using Fleming’s Right Hand Rule.

In both Fleming’s left and right hand rules, there is a relation between the magnetic field, the current and force. This relation is directionally determined by Fleming’s Left Hand rule and Fleming’s Right Hand rule respectively.

These rules do not determine the magnitude but instead show the direction of any of the three parameters (magnetic field, current, force) when the direction of the other two parameters is known. Fleming’s Left-Hand rule is mainly applicable to electric motors and Fleming’s Right-Hand rule is mainly applicable to electric generators.

An electric motor uses a current and a magnetic field to create motion. A specially shaped coil of wire, called an armature, is positioned between the poles of a permanent magnet. When an electric current is fed into the wire, the coil becomes a magnet too and forces of attraction and repulsion between it and the permanent magnet cause the armature to move around its axis. A device called a commentator then reverses the current, so that the armature’s magnetic poles are reversed and it turns through 180 degrees. If the current is continually reversed, the armature is always turning on its axis. It is this motion that can be used to drive a huge number of machines, such as washing machines, hairdryers and food processors.

An electric motor creates rotational, or circular, motion. The central part of the motor is a cylinder called the armature or rotor. The armature holds the rest of the components and is also the part of the motor that spins. Around the armature is the stator, which holds insulated coils of wire, usually copper. When a current is applied to the motor, the stator generates the magnetic field that drives the armature. Depending on the design of the motor, you might also find brushes, or fine metal fibers that keep current running to the opposite side of the motor as it spins.

The basic motor runs on DC, or direct current, but other motors can run on AC, or alternating current. Batteries produce direct current, while the outlets in your home supply alternating. In order for a motor to run on AC, it requires two winding magnets that don’t touch. They move the motor through a phenomenon known as induction. These induction motors are brushless, since they don’t require the physical contact that the brush provides. Some DC motors are also brushless and instead use a switch that changes the polarity of the magnetic field to keep the motor running. Universal motors are induction motors that can use either source of power.

Now that you have the basic parts and principles, you can play with the concept at home. Make a coil from lower gauge copper wire and poke each end through an aluminum can to suspend it. Place a small, strong magnet on either side of the suspended coil to create a magnetic field. If you attach a battery to both cans using alligator clips, your coil will become an electromagnet and the copper wire rotor you created should start to spin.

England paid tribute to the early-19th century novelist, Jane Austen by printing her image on the new 10-pound note, which replaced the image of naturalist Charles Darwin. It was issued on September 14, 2017.

The £10 note will be made of the same material as the £5 note, which means it also contains some traces of animal fat - an issue which caused concern for vegans and some religious groups when it was launched last September.

A petition to ban the note attracted more than 100,000 signatures but the new £10 will again contain some tallow, which is derived from meat products.

The Jane Austen quote on the note from Pride and Prejudice has also attracted some unfavourable comment.

The quotation: "I declare after all there is no enjoyment like reading!" is uttered by a character called Caroline Bingley who in fact has no interest in books and is merely trying to impress Mr Darcy, a potential suitor.

But Mr Carney defended the choice.

"It captures much of her [Jane Austen's] spirit, at least in my mind," he said. "It draws out some of the essence of some of her social satire and her insight into people's character. So it works on multiple levels."

A new polymer £20 featuring artist JMW Turner is due to be issued by 2020, but there are no plans to replace the current £50 note, which was released in 2011.

The Bank of England says the new £10 notes contain sophisticated security features and are expected to last five years, which is two-and-a-half times longer than the current note.

 

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