Top 10 Best Explanatory Essays on School Supplies

In today's rapidly advancing technological age, students have gained a new companion alongside traditional school supplies like books, pencils, and rulers: the computer.

The first computer was introduced in 1956. Initially, it was enormous, occupying an entire room, and could only perform basic arithmetic calculations. Over the years, thanks to the relentless efforts of scientists, the size of computers has shrunk significantly, resulting in the compact versions we use today.

A desktop computer consists of two major parts: the CPU and the monitor. The CPU is the most important part, as it processes complex data. The CPU is typically rectangular, measuring around 50 cm x 10 cm x 40 cm, and its exterior is made of metal with an insulating paint coating.

Inside the CPU, there is a hard drive, a processor, electrical circuits, and wiring. The front of the CPU is rectangular, measuring 10 cm x 40 cm, and contains small components for reading floppy disks, connecting USB devices, and controlling the machine. The back of the CPU has connectors for power, the monitor, keyboard, and mouse.

The computer monitor typically has a size and shape similar to a 21-inch television. However, thanks to technological advancements, today's monitors are just 2 to 3 cm thick and use liquid crystal display (LCD) technology.

In addition to the CPU and monitor, a keyboard and mouse are essential to complete a computer setup. The keyboard is rectangular, measuring about 16 cm x 25 cm, with raised keys for inputting data. The mouse is small and fits comfortably in the hand, with three buttons for controlling commands on the screen.

Using the computer is relatively simple. For students, it is primarily used for writing documents, using software applications, browsing the internet, and, of course, playing games!

To use the computer, first plug it into a power source, then turn on the CPU and monitor. Once the system is on, double-click the "W" icon (Microsoft Word) on the screen and start typing. To use other programs, open them and use the keyboard and mouse to input data and execute commands.

Thanks to the computer, students can quickly and efficiently exchange study materials, express emotions, conduct virtual experiments in physics and chemistry, and access important information for their education. Additionally, the computer provides a means of entertainment through video games.

The computer is an incredibly valuable companion for students. To ensure its longevity, it is important to regularly clean the keyboard, dust off the components, and keep the computer in a dry environment to prevent moisture damage. It is also recommended to install antivirus software to protect the machine from malicious viruses that could harm the data.

Every person has experienced the time of being a student. The school days, full of memories, are something we can never forget. School supplies such as pens, rulers, notebooks, and books are always by our side, like close friends. Among them, the ruler is an important tool widely used in education.

Origin: Rulers come in various types, including straight rulers, triangles, and protractors. A straight ruler typically takes the form of a rectangle, with varying lengths and widths. Commonly, it is about 15–20 cm long and 2–3 cm wide. There are also longer rulers, up to 30 or 40 cm. The thickness of the ruler differs as well—wooden rulers are usually around 1 cm thick, while the ones students use are typically 1 mm thick.

Unlike the straight ruler, a triangle, or 'ê-ke,' is shaped like a right-angled triangle, often an isosceles right triangle. The base is usually about 10 cm, with a height of 5–6 cm. Like the straight ruler, it is typically 1 mm thick, and its size can vary significantly. Some large triangles, used by teachers or engineers, can be up to 6 or 7 times bigger than a regular one. Another common type of ruler is the protractor.

The protractor is commonly used by secondary and high school students. It is shaped like a half-circle, or a semi-circle. Like other rulers, protractors come in various sizes, with typical diameters around 10 cm, but many are larger.

Rulers are made from plastic, wood, or metal, with plastic being the most common. Plastic rulers are light, durable, easy to use, and inexpensive but can break easily. A plastic ruler typically costs between 2,000 VND and 5,000 VND, making it popular among students. A set of plastic rulers, usually containing 4 or 5 pieces, can be bought for under 10,000 VND.

Recently, a new type of ruler has appeared, made from flexible plastic. These rulers can be bent without breaking. Metal rulers, though heavier and more expensive, are more durable and harder to break. They are commonly made from aluminum or steel.

Among the different types, wooden rulers are the most expensive. However, they are very durable, easy to use, and unlikely to break. Wooden rulers also offer a sense of elegance and sophistication. There are also many special types of rulers, like digital rulers, comb rulers, or rulers for drawing circles and curves.

The colors of rulers vary widely, especially plastic ones. Rulers for elementary school students are colorful, often featuring popular cartoon characters. Young students often choose rulers in their favorite colors—girls prefer pink or yellow, while boys tend to choose green or blue.

Middle school students, however, generally opt for transparent rulers with minimal designs for easy use. Some use metal rulers in silver or wood. Teachers typically use brown wooden rulers for marking on the blackboard. Most rulers have centimeter markings, with some featuring both centimeters and inches. Famous brands like Thiên Long or Win print their logos on the rulers they produce.

There are two main types of triangles: one is an isosceles right triangle with one 90-degree angle and two 45-degree angles; the other has one 90-degree angle, one 60-degree angle, and one 30-degree angle. Triangles often have angle measurements labeled, with the two legs of the right angle having centimeter and inch markings.

The protractor usually has centimeter markings on the base, and the angle measurements start from the center of the circle. The degree scale runs from 0 to 180 degrees, with each line representing 10 degrees. The degree numbers are written from left to right, and the numbers are often larger on the left side because people generally measure angles from left to right.

Rulers are essential tools in education and need to be used and preserved properly. They should only be used for drawing or measuring. After use, they should be kept in a pencil case to avoid losing them. If a ruler gets dirty, it should be cleaned with water or wiped with a cloth. Rulers should be handled gently, and they should be treated as valuable companions throughout one's school life.

Do not turn a ruler into a weapon to tease others, such as using it to hit or poke someone. Avoid breaking rulers when angry. Additionally, rulers should not be carved into desks, chairs, or trees, nor should they be thrown carelessly. Take good care of rulers to avoid smudging the markings.

Rulers are incredibly useful for everyone. A straight ruler helps us measure and draw straight lines. It allows us to create line segments of specified lengths and underline important information. Triangular rulers help us verify right angles and draw shapes in geometry. They can also be used for drawing or measuring lines.

Protractors are used to measure and draw angles. With rulers, we can complete the assignments given by our teachers, measure the sizes of things around us, and, most importantly, create technical drawings. For architects, rulers are essential for creating accurate and beautiful design plans. These plans are the foundation for building structures and houses.

The ruler is a close friend to every student, and I have been using it for many years. It has become like a true companion to me. It is with me every day. Whenever I see it, I remember the old days when I carved my name on the desk at the end of the fifth grade. I cherish the rulers I use every day. Although rulers are inanimate objects, to me, they symbolize memories and are items I hold dear. These seemingly lifeless objects have helped me grow.

Undoubtedly, the ruler is an important and necessary school tool, just like notebooks and books—things that every student carries to school. I truly value my rulers. Oh, how I love my ruler!

Is there anyone in life who has never written or simply sketched a few lines? Truly, there is no one who hasn't once held a pen, particularly a fountain pen.

Everyone uses a pen, regardless of age or profession. In daily life, pens are essential tools, close companions to learners. For those far apart, the fountain pen allows people to express their thoughts and things they want to say when direct communication is not possible.

The pen bridges the gap between people, bringing them closer across space and time, becoming a messenger that connects hearts. Many renowned works of literature and art were created with small, delicate pens. Pens have helped humans build a rich culture and vast knowledge for mankind.

In another case, historians and soldiers in wartime used pens to record historical events and immortal songs. The pen, much like the time machine from the famous cartoon Doraemon, transports people back in time, allowing them to witness past events. Indeed, the fountain pen has great value to humanity. But to have the convenient fountain pen we use today, a long process of development has taken place.

The first pen can be said to have been simple charcoal or stones etched on cave walls or turtle shells. Around 3000 years ago, the Sumerians were the first to write on clay tablets to record history. During the era of ancient Egyptian civilization, the concept of pen and paper was formally established (at that time, paper had been invented).

The pens of that era were made from reed stems, with the tips crushed to hold ink. Over time, the reed pen became sharper with a notch at the end. This marked the beginning of the pen’s history, followed by the quill pen (made from swan or goose feathers), where ink was dipped at the tip. This type of pen had the advantage of a sharpenable, flexible tip that was less prone to breaking under pressure.

Thus, the quill pen lasted for centuries, and it gave rise to the culture of calligraphy and painting that was widespread in the East (China, in particular, is a country with a deep cultural connection to the quill). Meanwhile, in the West, during the 19th century, people invented a pen that also used ink dipping, but the nib was made of metal instead of animal hair, making it more durable and providing more precise writing.

However, this pen had the drawback of always needing an ink bottle, and the ink would sometimes flow unevenly. In 1884, a major breakthrough in pen development occurred, as the first fountain pen was invented by Lewis Waterman. His invention came about quite by accident: he was frustrated by the constant need to carry an ink bottle, the slow writing speed, and the blotchy ink marks, which were hindering his work.

Waterman was determined to find a solution that had baffled experts for centuries. He finally discovered the relationship between capillary action and atmospheric pressure. The answer was to design a pen with an ink reservoir that would only release ink when in use. To achieve this, Waterman created two or three grooves in the pen’s feed system that allowed both ink and air to flow simultaneously.

This allowed the ink to be replenished and ensured a steady flow as the pen was used. Thus, the fountain pen was born and has remained with us to this day. The fountain pen has two main parts: the body and the nib. The body is usually made of metal to protect the pen and facilitate smooth writing. The nib itself is more complex, with the ink reservoir being a crucial part of the revolution in pen design. It is an empty chamber that holds the ink.

When refilling, you simply dip the nib into the ink bottle, squeeze the ink cartridge gently, and release it. By the 20th century, pens had been invented that didn’t require refilling but instead had a built-in ink reservoir. The ink reservoir is connected to the feed system, which consists of channels ensuring smooth and controlled ink flow. The key component in this is the ink sac.

The ink sac is cylindrical, hugging the nib, with grooves that align with the nib’s channels to deliver the ink. The groove at the base tapers towards the nib. With the nib and ink sac in close contact, the ink flow is controlled, providing a fine and clean writing line. The nib itself is typically made of metal and has a tapered, trough-like shape that fits perfectly with the ink sac.

The tip of the nib is pointed, with a small ball known as the “rice grain” to ensure smooth writing and prevent tearing the paper. The nib’s surface often bears the manufacturer’s logo. All of these components come together to create an indispensable item in our daily lives.

Today, with advancing technology, there are many choices for fountain pens. Numerous renowned and reputable brands from Vietnam and around the world, such as Hong Ha, Thien Long, Waterman, Parker, Montblanc, and Pelikan, offer a wide variety of fountain pens.

Fountain pens now come in many colors and designs. Some pens even feature cute characters loved by children, like Mickey Mouse and Hello Kitty. Whereas in the past, fountain pens were simple and made from basic materials, today, people showcase their status with pens that have precious metal nibs and cases adorned with diamonds or gemstones.

Fountain pens are also meaningful and practical gifts. For many people, they are not just writing tools but also essential accessories in personal style. Even as information technology becomes more important, people have not forgotten the humble fountain pen, a trusted companion in our lives. As a student, I love my fountain pen, and I always sing this song:

“Desk, chair,”

“Books and notebooks,”

“Ink and pen,”

“Chalk and board…”

The fountain pen is always our companion on the path of learning.

The pencil is a familiar tool created to serve human life, especially in learning and for students. It can be said that the pencil has become a close friend, one that has accompanied us for a long time, perhaps since the first day we entered school.

For a long time, the pencil has been present with people, bringing many functions. Simple and easy to use. In earlier centuries, pencils were much larger, three or four times the size of the modern ones. The outer body was made of wood, rough and unsharpened, looking quite strange and amusing. If not looked closely, many people would mistake it for just a regular piece of wood. The tip of the pencil had a piece of lead protruding, as sharpeners had not been invented at the time, leaving the pencil tip quite blunt. These were the first pencils used by humankind.

Over hundreds of years, although a considerable amount of time passed, the pencil remained a simple tool but gradually improved in design. The pencil was about the length of a hand, slender and compact. The core inside was a piece of lead encased in a wooden shell. Over the years of improvement, the wooden shell became smoother, the wood better, and harder to break.

When first purchased, the pencil’s tip was not sharpened, and the length of the lead and the wooden casing were equal. After sharpening, the tip of the pencil would become triangular in shape. The pencil became even more useful when an eraser was attached to the end of the pencil. Our pencil is indeed quite simple, isn’t it?

Nowadays, pens and ballpoint pens are much more popular, but no one has forgotten the familiar pencil. From a young age, we held the pencil, clumsily drawing circles, and gradually mastering the art of writing. Do you think the pencil has become a true friend of ours? From the first pages of notebooks, the uneven strokes left by the pencil also remind us of that dear friend.

Furthermore, the pencil allows us to create drawings, depicting objects and people through the skilled hands of talented artists. To create a painting, we always need a pencil, a very handy tool. Another unique feature of the pencil is that if we accidentally make a mistake while writing or drawing, it can be erased, unlike ballpoint pens. This makes the pencil more versatile and memorable, ensuring that people will never forget it.

Although the pencil is well-known and loved by many, some people are careless and neglect it, throwing it away, or even breaking it. Despite its affordable price, even cheaper than most tools, the pencil is incredibly useful and practical.

Pencils come in various degrees of darkness and lightness, and manufacturers label the pencil’s grade on the body, making it easier for users to choose when purchasing. Additionally, the market now offers mechanical pencils in various bright colors, which appeal to children. However, I believe that the traditional pencil holds a closer connection to people.

Have you ever thought that a pencil engraved with a name would become meaningful if used as a gift? Although it is just an ordinary pencil, it carries deep affection and trust. When we gift these pencils to our friends, it will help them take notes, draw beautiful pictures, or display it somewhere. Every time they see the pencil, they will think of us.

It would be unfortunate if we lost our beloved pencil and when we needed it, it was no longer there. Therefore, we should take good care of it. The pencil is very meaningful to students. However, some people use pencils improperly, writing or drawing carelessly on tables, chairs, or walls, which is not appropriate. Let’s use the pencil properly and ensure it remains a useful and valuable tool.

In conclusion, the pencil is a close and familiar friend to us, a commonly used tool at an affordable price. The pencil is truly meaningful, isn’t it? Let’s take good care of it, and if possible, continue to make the most of it so that the pencil will always remain a necessary item and a cherished companion for students.

Nothing exists in isolation in human society; everything is interconnected and supports one another. Therefore, since students began attending school, school bags have come into existence. Once people started using pens and rulers for studying and work, pencil cases were created to store them. The pencil case is a very familiar tool for students, but to fully understand it, we need to look at it from several perspectives.

There isn't a specific criterion for classifying pencil cases, but if we look at their materials, we can roughly divide them into categories: plastic pencil cases, wooden pencil cases, fabric pencil cases, and felt pencil cases... Based on this classification, we can begin to understand the variety of pencil cases in terms of colors, patterns, and designs.

In the past, pencil cases were usually made of dark brown or black wood, but today they are available in countless colors. We can easily find pencil cases shaped like Doraemon or Mickey Mouse for girls, or superhero designs like Spiderman or Superman for boys. Manufacturers also engrave names or logos on pencil cases to give them a personalized touch.

Despite the variety, pencil cases generally have two parts: the outer shell and the inner compartment for storing writing tools. The exterior often features eye-catching designs and logos of the manufacturers. Some pencil cases even have small compartments for holding a compass, scraps of paper, or other tiny items.

The inside of the pencil case is securely closed with a zipper, where students store pens, rulers, colored pencils, and other tools. For many plastic or wooden pencil cases, the zipper is replaced with a clasp or button closure.

Thanks to pencil cases, students can neatly organize their study materials such as pens, rulers, compasses, colored pencils, and sticky notes, making it convenient to carry them to school or exams. Additionally, pencil cases serve to protect writing tools and other items inside.

Pencil cases are companions for students, as well as professionals in various fields. For us, a pencil case is not just a storage tool, but also a place where memories are kept, like a handwritten letter, a page from a journal, a note, or even a piece of candy gifted by a friend. Therefore, we should cherish and carefully protect this item, avoiding letting it rub against rough surfaces, fall to the ground, or get ink stains on it.

“The sweet purple ink on the white shirt

Don’t bring the clouds down, away from the sky”

The school years, with their white uniforms and dreams of the future, would be incomplete without good friends like pens, rulers, backpacks, and pencil cases. I’m grateful for these seemingly insignificant companions, and I will make sure to use my pencil case in the most effective and meaningful way possible.

At the beginning of the 21st century, humanity entered a technological revolution. It could be said that the turn of the century marked a time when people witnessed the rise of large-scale industries. Along with this, millions of devices were created, and pocket calculators became a familiar tool among students and learners.

It might seem like the pocket calculator was invented just a few decades ago, but behind this small device lies a vast history spanning over 4,000 years, filled with scientific advancements. Dating back to 2000 BC, the ancient Egyptian merchants used the abacus, a set of beads threaded into vertical rows within a rectangular frame, to help reduce the time spent on calculations.

Following this, the Pascal adding machine was improved, followed by the legendary Leibniz wheel, the 25 kg CS-10A Sharp computer, and with continued efforts, the ELK 6521, which weighed less, eventually leading to the pocket-sized LE-120A "HANDY" Busicom calculator. After numerous upgrades and innovations, we now have pocket calculators that weigh under 200g, easily fitting into a student’s bag.

Today, the market offers a variety of manufacturers producing pocket calculators, with brands like Casio offering numerous models. These calculators are categorized based on their functions: graphical calculators, which can create wide-ranging graphs; programmable ones, equipped with many mathematical functions and advanced programming capabilities; scientific-financial calculators, which have large memory capacities and can store many programs; and textbook display models, which are mainly used by students.

For instructors and teachers, there are also calculators that are fully equipped, capable of projecting images directly onto overhead projectors (OHP) and connecting to computers. Models such as the FX-220, FX-500A, FX-500 MS, and FX-570 MS are authorized by the Ministry of Education and Training for use during exams such as high school graduation or university entrance tests. Despite belonging to the same category, these pocket calculators have similar yet varied functions.

The structure of a pocket calculator includes two main components: the body and the cover. The body consists of an input section with buttons and an output section that displays information on a liquid crystal display (LCD). Inside, a microprocessor chip performs calculations, while a circuit board with rubber buttons enables user input.

Just like humans, the calculator responds to electrical signals, with the central processor analyzing and processing these inputs. When a button is pressed, the control circuit closes the rubber membrane and sends an electrical pulse to the microprocessor, which then displays the result on the screen.

Most pocket calculators use LED or vacuum diodes for their screens. Over time, the introduction of liquid crystal displays (LCD) helped save power. In the past, the calculators required bulky battery systems, which contributed to their larger size.

Today, technological advancements have made it possible to design smaller batteries, reducing the overall size of pocket calculators. Since the 1970s, many pocket calculators have included solar cells to provide power. These calculators also have the ability to store short-term data, similar to RAM.

While the function of a pocket calculator may seem simple, the underlying technology is quite complex. The device performs calculations thanks to its integrated circuit and microprocessor chip. These circuits use transistors to perform basic operations such as addition, subtraction, and even more complex operations like exponentiation. The computational power of the calculator depends on the number of transistors it contains—more transistors allow the calculator to handle more complicated calculations.

Today’s advanced pocket calculators are equipped with highly integrated circuits and similar numbers of transistors. Like other electronic systems, the microprocessor converts the data entered through the keyboard into binary code, displaying the results as 0s and 1s. The integrated circuits use binary logic to switch the transistors on and off, which ultimately leads to the desired outcome.

Pocket calculators have become indispensable in our daily lives. For students, they are crucial tools for studying subjects such as mathematics, physics, chemistry, and biology. Beyond helping with studies and exams, calculators are widely used in business and various professional fields, such as at cash registers in stores.

Pocket calculators are simple devices that replace traditional methods of doing calculations, whether by hand or mental math. They allow for fast, accurate results. The invention of the pocket calculator has saved individuals a significant amount of time when performing calculations. For complex operations, calculators can complete tasks much faster than traditional methods. Moreover, they guarantee high accuracy, especially for intricate mathematical operations.

As technology continues to advance, pocket calculators are evolving, offering even more sophisticated functions. Today, they are no longer just for basic calculations; they have expanded to include applications such as calculating body mass index (BMI), calorie content, currency conversion, and even estimating carbon emissions.

However, to ensure the effective use of a calculator, it’s important to know how to operate it properly. To turn the calculator on, simply open it and press the ON button. To turn it off, press the OFF button. The calculator’s buttons are grouped into categories: white buttons for direct functions, yellow for those activated after pressing the Shift key, red for functions accessed after pressing the Alpha key, and purple for programming functions.

It’s equally important to know how to take care of the calculator to ensure its longevity. During use, avoid dropping the device or placing heavy objects on it, as this can damage the display. Regularly replace the batteries—ideally once a year—since weak batteries can affect the performance of the calculator.

We should also avoid storing the calculator in areas with high temperature, humidity, or dust, and stay away from places with strong magnetic fields. Do not press the keys with sharp objects like pens or use harsh chemicals to clean the keypad. Instead, use a soft, damp cloth for cleaning.

Today, as the global industry continues to advance with ongoing creativity and research, scientists are constantly finding ways to improve pocket calculators, making them more useful and contributing to making life easier and more convenient. In the future, pocket calculators will continue to be valuable companions for students, and essential tools in daily life for people worldwide.

Throughout history, books have been an invaluable source of knowledge, serving as an essential educational tool for humanity. Books provide us with knowledge across all fields of study, offer opportunities for relaxation and entertainment, and sometimes even influence our lives in significant ways. Among these, the 8th Grade Literature Textbook, Volume 1, stands out as a particularly valuable and indispensable resource for every middle school student.

Like any other book, the cover is an important feature as it represents the subject matter the book aims to convey to its readers. As with other textbooks, the 8th Grade Literature Textbook, Volume 1, is beautifully designed and well-organized. The cover is made of sturdy pink paper, which gives it a bright and appealing appearance.

At the lower right corner of the cover is the name and logo of the Vietnam Educational Publishing House. In the center of the cover, a bunch of daffodils is blooming, as if welcoming readers to the treasure trove of knowledge meant for 8th grade students. Above this, the words “Ngữ văn” in blue, along with the number 8 in white, are prominently displayed on the pink background. The size of the book, 17 x 24 cm, is perfectly suited for students to hold comfortably.

The book is nearly two hundred pages long and contains a wealth of useful information. The back cover is also made of sturdy white paper. At the top, there is an emblem symbolizing the quality the book achieves. In the center, the names of the textbooks for 11 subjects are listed. After the cover page, the first page features a “Foreword” that introduces the purpose and general content of the book to the reader. The paper used for printing is white, with a balanced brightness and bold, clear lettering to ensure readability and protect students' eyesight.

The book contains 17 lessons, and each lesson has a header that outlines the key knowledge to be gained. Each lesson typically follows a three-part structure: a “Text,” a “Vietnamese Language” section, and a “Writing Practice” section, all presented in a clear and logical sequence. After each lesson, there is a “Key Takeaways” section framed in a box, followed by a “Practice” section to help students review and deepen their knowledge.

The literary texts are accompanied by illustrations that prevent the material from becoming dry or monotonous. On the contrary, each lesson feels like a new discovery, sparking curiosity and interest in students. The illustrations not only provide visual engagement but also help students better imagine and understand the content. The knowledge presented in the textbook is both diverse and rich.

The literary section includes various forms such as short stories, novels, and memoirs, allowing us to better understand the lives of Vietnamese farmers and their noble qualities under the colonial feudal society. The poetry section features patriotic poems from the early 20th century by Phan Bội Châu, Phan Châu Trinh, Trần Tuấn Khải, and others.

These poems not only carry educational value, teaching moral integrity and patriotism, but also showcase the different aesthetic qualities of lyrical works. Alongside Vietnamese literature, the textbook introduces foreign literature from countries such as Denmark, the U.S., Russia, and Spain, broadening students’ perspectives.

The short stories, though simple, convey a powerful spirit of humanism, expressing love and empathy for those in need while also offering insight into the societies of other countries in the 19th and 20th centuries. The Vietnamese Language section teaches students how to use words, sentence structures, and punctuation appropriately depending on the context and communication situation.

The Writing Practice section helps students refine their understanding of texts and develop their skills in writing. It focuses on core writing techniques, such as constructing a clear structure, linking paragraphs, and applying methods to write different types of essays. In 8th grade, students primarily focus on narrative, expository, and argumentative essays.

The harmonious integration of different modes of expression is a common feature in literary works. Therefore, the content in the Writing Practice section encourages students to understand texts more deeply. At the end of the book, there is a table of contents to help students easily find and refer to the lessons. The 8th Grade Literature Textbook is an invaluable resource, and as such, it should be kept clean and preserved—covering it with plastic wrap will help prevent wear and tear.

The 8th Grade Literature Textbook, Volume 1, is a treasure trove of knowledge, an essential resource for every middle school student.

For students, the everyday companions that accompany us to school are rulers, pencils, books, and more, but one indispensable friend that helps us erase our mistakes is the eraser. This small yet essential tool has a long history and numerous practical uses for humans.

The first eraser was invented hundreds of years ago, during a time when pencils were made of lead and tin, making them quite rigid. Back then, people used bread crumbs to erase written errors. As pencils evolved, the eraser also underwent significant advancements. The first modern version of the eraser was invented by a British engineer named Edward Nairne, who created it during an invention competition. After its invention, it became widely used and popularized in the market.

After winning the competition, Mr. Nairne shared that the idea for the eraser came to him when he picked up a piece of rubber on the street and discovered its ability to erase ink stains. Based on this discovery, he went on to create the first eraser. This story shows how great inventions often come to us unexpectedly, and how intelligence lies in recognizing an issue and finding a way to apply it practically.

The eraser consists of two main parts: the eraser itself and its casing. The casing is usually made of stiff paper, which bears barcodes, brand names, or even decorative designs. The eraser's core comes in various colors—white, black, blue, red—and is typically made from a mixture of cooking oil, pumice, and sulfur, all bound together by rubber.

There are several types of erasers available. Some erasers are attached to pencils, typically pink, and made from hard rubber. These can be used immediately to erase mistakes, though they can sometimes be difficult to use as pressing too hard can tear the paper, making them less frequently used.

There are also white, flexible erasers made of vinyl plastic, which are easier to use, ensuring a clean sheet of paper. These are much more popular. Another type is the kneaded eraser, which is less commonly found on the market. This eraser is much softer than the others, and you can knead it like dough. It absorbs pencil graphite, leaving no crumbs behind when used. Many people enjoy using this type because it completely removes stains without causing any dust.

Additionally, with the advancement of modern technology, the electric eraser was invented. This type features a button, and with a simple press, it erases marks effortlessly. Though this type is more expensive, it offers the benefits of cleaning the paper without causing any damage, saving time for the user.

Using an eraser is simple: aside from the electric eraser, which requires specific handling, other erasers are used similarly. When making a mistake, you simply rub the eraser gently over the affected area, and the mark will disappear. It's important to avoid pressing too hard, as that can damage the paper.

After using an eraser, it's important to store it properly. If the eraser falls on the ground and gets dirty, using it again will result in smudges on the paper. As with all tools, proper storage is key to prolonging their use.

The eraser is a common tool in the education of students, designers, and others, playing an essential role for everyone. It allows us to correct our mistakes and erase incorrect marks.

Since its invention, the eraser has remained a beloved tool. Even with the advances in science and technology, the eraser will continue to be a trusted companion for students, engineers, designers, and others.

In every student's academic journey, many tools serve to aid in acquiring knowledge efficiently. Among these essential study aids, the ballpoint pen is one of the most indispensable tools, always by our side to record and retain important lessons.

The ballpoint pen was invented by Hungarian journalist László Bíró in the 1930s. His discovery stemmed from research into fast-drying ink, leading him to create a pen that utilized such ink. It wasn't until 1938 that the first ballpoint pen was manufactured.

The ballpoint pen is a simple yet effective writing instrument, with an uncomplicated mechanism. A typical ballpoint pen consists of two main components: the outer casing and the ink refill. The casing is a cylindrical tube, typically measuring 15–20 cm in length, made of flexible plastic, hard plastic, or colored plastic, often featuring details like manufacturing information or dates.

The second part is the refill, which is a small ink-filled tube about 10–15 cm long, depending on the pen. The pen's tip is made of rust-resistant metal, and it has a small ball bearing at the point. The ball's diameter varies depending on the pen model, typically ranging from 0.5 to 0.7 mm. This ball moves smoothly, pushing the ink out evenly.

In addition to these main parts, the pen may include smaller components such as a spring, a click button, a cap, or a clip on the casing for easy attachment to a pocket or notebook. These small parts are crucial for the pen's proper functionality.

Today, ballpoint pens come in a wide variety of designs and colors, catering to different tastes and age groups. Some pens feature a single tip, while others have multiple tips with different ink colors such as blue, red, black, or purple. Famous ballpoint pen brands, such as Thiên Long and Bến Nghé, are widely available. The price of a ballpoint pen is relatively affordable, ranging from 2,500 to 10,000 VND.

The ballpoint pen is an inseparable tool for students. It is a necessary item, a constant companion throughout life. The pen is used by students and professionals alike for writing, sketching, note-taking, and record-keeping. It's also a popular, meaningful gift choice.

Compared to fountain pens or pencils, the ballpoint pen is favored for its durability, compact size, and ease of transport. Its smooth writing tip is ideal for quick notes, and it doesn't require re-inking like a fountain pen. Furthermore, it's affordable. However, one limitation of the ballpoint pen is that if used too quickly, the ink may smudge, and the writing may not be as elegant as that produced by a fountain pen.

Ballpoint pens are easy to maintain. The pen's tip is especially important, and the ball bearing can be damaged, so it's best to retract the tip or cap it after use to protect the ballpoint. Avoid dropping the pen, as this may damage the ball or casing. Also, store the pen in a place with a moderate temperature to prevent damage.

The ballpoint pen is more than just a convenient tool for writing; it is a companion throughout life. It holds countless lecture notes, helps young girls record their favorite song lyrics, and preserves the memories and emotions written in diaries and notes during school days. The ballpoint pen is a vessel for many cherished memories.

Although computers are becoming increasingly widespread, with people now choosing to type rather than write with pens, the ballpoint pen will undoubtedly remain a useful and irreplaceable tool for today and in the future.

Throughout a student's educational journey, the schoolbag is a constant companion, alongside books, notebooks, pens, rulers, and other essential items. Among these tools, the bag serves as a key storage solution, holding everything together. It has been a part of my life for many years and is likely to continue being an essential part of my future!

Schoolbags are used extensively both in education and daily life. Without a doubt, the invention of the schoolbag is one of humanity's significant milestones. The idea for the schoolbag was conceived by an American inventor in 1988.

In terms of design, the most noticeable external features are the flap, the handle, the bag's clasp, and in some cases, straps or small wheels for easy transportation. Inside, the bag can have one or multiple compartments for holding books, stationery, raincoats, and even money or snacks.

The process of making a schoolbag involves several key steps: selecting the material, processing, sewing, and assembly. There are numerous materials available, each chosen to suit the user's needs, such as felt fabric, canvas, crocodile leather, or synthetic leather.

No matter the material, durability is crucial, as the bag needs to withstand the heavy load of books. Additionally, the bag's design must be practical, such as boys often opting for slung bags to appear dynamic and bold, while girls may carry their bags in front when wearing traditional dresses for a more delicate look. Children, on the other hand, prefer wearing their bags on their backs for ease of movement. Various colors and patterns make these bags appealing to different age groups.

Some tips for using a schoolbag correctly: avoid exceeding 15% of your body weight when carrying it. Place heavier items closer to your back for better balance. Organize books and supplies to prevent them from shifting during use.

It is important to make sure that all the items inside the schoolbag are essential for daily activities. If you have a two-strap bag, it is not advisable to wear just one strap, as this could lead to poor posture. For bags with only one strap, alternating the shoulder used will prevent strain. When choosing a bag, look for one with padded straps or cushioning for comfort.

There are many well-known brands such as Miti, Samsonite, Tian Ling, and Ling Hao, available globally in places like Taiwan, Japan, and South Korea. However, no matter how stylish or durable these bags are, they will eventually wear out over time if not properly maintained. It's essential not to throw your bag recklessly, especially when frustrated or excited. Regularly clean the bag to maintain its condition.

In conclusion, the schoolbag is an essential item for students, not only for learning but also for daily life. If used properly, it can offer significant benefits and become a trusty companion throughout our journey, especially for students—the future leaders of the country.