AR34 172 W  Who Invented the Telephone?

The telephone is one of the most important inventions in history. It helps people talk to each other from far away. But who made the first telephone? Alexander Graham Bell is known as the inventor of the telephone. He made the first working telephone in 1876. Bell was a teache...

AR34 179 W  What Does a Car Look Like?

A car is a machine that people use to travel on roads. Most cars have four wheels, a metal body, and seats for people to sit in. Cars come in many colors, shapes, and sizes, but they all have the same basic parts. At the front of the car, there are headlights to help drivers s...

AR34 166 W  When Did the First Airplane Fly?

The first airplane flew in the early 1900s. Two brothers, Orville and Wilbur Wright, worked hard to build a flying machine. They lived in the United States and were very interested in science and flight. After many tries, the Wright brothers made a small plane called the Flyer...

AR34 180 W  Who Invented the Light Bulb?

The light bulb is one of the most important inventions in the world. It helps people see in the dark and changed how we live. But who invented the light bulb? Many people worked on electric lights in the 1800s, but the most famous inventor is Thomas Edison. He made a light bul...

AR34 201 W  How Was Paper Made?

A long time ago, people did not have paper. They wrote on stone, clay, or animal skins. These things were heavy, hard to carry, and not easy to use. People needed something better. Then, over 2,000 years ago in China, paper was made for the first time. A man named Cai Lun made...

AR34 188 W  How Does a Refrigerator Keep Food Cold?

A refrigerator is a machine that keeps food cold and fresh. Cold air slows down germs and bacteria, so food lasts longer. But how does a refrigerator make things cold? Inside the refrigerator, there is a special liquid called refrigerant. This liquid flows through pipes and ch...

AR34 193 W  How Does a Clock Tell Time?

A clock is a tool that helps us know what time it is. People use clocks every day to wake up, go to school, eat meals, and do many other things. But how does a clock tell time? Long ago, people used the sun and shadows to tell time. Later, they made water clocks and sand clock...

AR34 210 W  How Does a Computer Work?

A computer is a smart machine that helps people do many things. We use computers to write, draw, play games, watch videos, and search for information. But how does a computer work? Inside every computer is a part called the CPU, or central processing unit. It is like the brain...

AR34 191 W  Why Were Glasses Invented?

Glasses are tools that help people see better. Some people have eyes that cannot see clearly. Words may look blurry, or far-away things may be hard to see. Glasses were made to fix these problems. A long time ago, people with poor vision had no way to fix it. They had to live ...

AR34 201 W  How Is a Pencil Made?

A pencil is a tool we use to write and draw. It looks simple, but it goes through many steps before we can use it. So, how is a pencil made? The middle of a pencil is not made of lead. It is made of a mix of graphite and clay. Graphite makes the pencil dark, and clay makes it ...

AR34 189 W  When Did People Start Using Umbrellas?

Umbrellas are used to stay dry when it rains and to stay cool when the sun is hot. But umbrellas are not a new idea. People started using umbrellas a very long time ago. The first umbrellas were used more than 4,000 years ago in ancient Egypt and China. At that time, umbrellas...

AR34 171 W  Why Does a Chair Look Like That?

A chair is something we use every day to sit. It usually has a flat seat, four legs, and a backrest. But why is a chair made this way? Long ago, people sat on the ground or on stones. As time passed, they made wooden stools with no backs. These were the first simple chairs. La...

AR34 180 W  How Does an Eraser Erase?

An eraser is a small tool that helps remove pencil marks from paper. We use it at school, at home, and at work. But how does an eraser erase? When you write with a pencil, the pencil leaves graphite on the paper. Graphite is a soft black material that sticks lightly to the sur...

AR34 167 W  Who Invented the Television?

Television is a machine that lets us see pictures and hear sounds from far away. We use it to watch shows, news, and movies. But who invented the television? Many inventors helped make the television. One of the first was John Logie Baird from Scotland. In 1926, he showed the ...

AR34 174 W  When Was the Internet Invented?

The internet is a big part of our lives today. We use it to search for information, watch videos, send messages, and play games. But when did the internet begin? The idea of the internet started in the 1960s. At that time, the U.S. government wanted a way to send information b...

AR34 186 W  What Does a Camera Do?

A camera is a machine that takes pictures. People use cameras to remember special moments, make art, or share what they see. But how does a camera work, and what does it do? A camera has a lens on the front. The lens lets light enter the camera. When you press the button, the ...

AR34 176 W  How Does a Bicycle Move?

A bicycle is a simple machine that people use to move from place to place. It does not need gas or electricity. It moves with the power of your legs. But how does a bicycle work? When you sit on a bicycle and push the pedals with your feet, the pedals turn a chain. The chain i...

AR34 184 W  How Do Robots Work?

A robot is a machine that can do work by itself. Some robots move, some talk, and some help people with jobs. But how does a robot work? Robots have four main parts: a body, sensors, a brain (computer), and motors. The body holds everything together. Sensors help the robot see...

AR34 205 W  How Does a Washing Machine Work?

A washing machine is a machine that helps clean dirty clothes. It saves people time and energy by washing, rinsing, and spinning clothes all in one place. But how does a washing machine work? First, you put clothes, water, and soap into the machine. Then you press a button to ...

AR34 188 W  How Are Inventions Made?

An invention is a new tool, machine, or idea that helps people. Many things we use every day, like phones, bicycles, or toothbrushes, were once inventions. But how are these things invented? Inventions often start with a problem. A person sees something that is hard to do or t...

AR34 194 W  How Were Curtains Invented?

Curtains are cloths that hang over windows. They help block light, give privacy, and keep rooms warm or cool. People use curtains in homes, schools, and offices. But where did curtains come from? Long ago, people didn¡¯t have glass windows like we do now. They had open holes i...

AR34 186 W  How Does a Microscope Work?

A microscope is a special tool that helps us see things too small for our eyes. With a microscope, we can see cells, tiny bugs, and even the parts of plants and drops of water. But how does a microscope work? Most microscopes use lenses to make small things look bigger. A lens...

AR34 194 W  Who Invented the Computer Mouse?

The computer mouse is a small tool that helps us move a pointer on the screen. We use it to click, drag, and open files. But who invented the computer mouse? The first computer mouse was invented by a man named Douglas Engelbart. He made it in 1964 in the United States. His mo...

AR34 197 W  How Does a Key Open a Lock?

A key is a small metal tool that opens a lock. People use keys to open doors, boxes, lockers, and cars. But how does a key open a lock? Most keys are made to fit into a lock called a pin tumbler lock. Inside this lock are small parts called pins. These pins are stacked in two ...

AR34 201 W  When Were Pots First Used?

A pot is a deep container used for cooking food. People use pots to boil water, make soup, or cook rice. But when did people first start using pots? Pots have been around for thousands of years. The first pots were made in the Stone Age, about 10,000 years ago. Early people us...

AR34 184 W  How Does a Flashlight Shine?

A flashlight is a small tool that helps us see in the dark. People use flashlights when the lights go out, when camping, or when looking for something at night. But how does a flashlight shine? A flashlight works by using electricity from batteries. Inside the flashlight, ther...

AR34 190 W  Who Invented the Kite?

A kite is a light object made of paper, cloth, or plastic that flies in the sky with the help of wind. People fly kites for fun, festivals, and even for science. But who invented the kite? The first kites were made over 2,000 years ago in ancient China. A man named Mozi, a Chi...

AR34 201 W  How Does a Zipper Work?

A zipper is a small but useful tool found on clothes, bags, and jackets. It helps things open and close easily. But how does a zipper work, and what is its structure? A zipper has two rows of teeth. These teeth are made of metal or plastic and are placed side by side. Each too...

AR34 188 W  Who Invented Toothpaste?

Toothpaste is something we use every day to keep our teeth clean and healthy. It helps remove food, fight germs, and make our breath fresh. But who invented toothpaste? The idea of toothpaste is very old. More than 4,000 years ago, people in ancient Egypt made a kind of tooth ...

AR34 198 W  How Does a Roller Coaster Move?

A roller coaster is a fun ride at amusement parks. It goes up high, drops down fast, and twists and turns. People scream with excitement as it zooms along the tracks. But how does a roller coaster move? At the start, the roller coaster is pulled up a tall hill by a chain and m...