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1
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 ...
E-BOOK
2
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...
E-BOOK
3
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 flig...
E-BOOK
4
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 ...
E-BOOK
5
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 ye...
E-BOOK
6
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, ther...
E-BOOK
7
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 use...
E-BOOK
8
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 com...
E-BOOK
9
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. ...
E-BOOK
10
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 o...
E-BOOK
11
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 us...
E-BOOK
12
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 passe...
E-BOOK
13
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 graphit...
E-BOOK
14
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 televisi...
E-BOOK
15
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...
E-BOOK
16
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 ...
E-BOOK
17
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 ...
E-BOOK
18
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 (compu...
E-BOOK
19
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...
E-BOOK
20
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? Invent...
E-BOOK
21
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? L...
E-BOOK
22
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 microsco...
E-BOOK
23
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 b...
E-BOOK
24
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 lo...
E-BOOK
25
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. Th...
E-BOOK
26
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 f...
E-BOOK
27
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 firs...
E-BOOK
28
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...
E-BOOK
29
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 ve...
E-BOOK
30
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 mov...
E-BOOK

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