NTSC
TVs use special rules to work. These rules help show pictures. They help show color too. This helps you see shows at home. It is a very cool way to watch. Do you like watching TV?
Early Reader · Change the reading level on the articleTechnology articles — Page 60
Explore inventions, engineering, computing and the tools people build to solve problems. Choose an article below; its reading controls let you move between the available levels.
4,107 public articles · Page 60 of 86
Try related engineering and scientific-investigation activities in Science Lab.
Nuclear engineering
Some people use tiny bits of matter for power. They make heat to make light. This heat can make power for our homes. It helps us turn on lights. It is a big job. Do you want to learn more?
Early Reader · Change the reading level on the articleNuclear fuel cycle
We get power from special rocks. We dig them up from the ground. Then we make them into fuel. This fuel helps make light for us. It is a big job. Can you imagine how it works?
Early Reader · Change the reading level on the articleNuclear marine propulsion
Some big ships use special heat. This heat makes steam. The steam turns a wheel. This wheel moves the ship. It can go for a long time. It does not need much food. Can you see a big ship?
Early Reader · Change the reading level on the articleNuclear meltdown
Some power plants get very hot. They need water to stay cool. If the water stops, the heat can melt the parts inside. This is a big problem. It can be bad for people and animals. Have you ever seen something melt?
Early Reader · Change the reading level on the articleNuclear power plant
Big plants make power for us. They use heat to make steam. The steam turns a big wheel. This makes the lights turn on. It helps our world stay clean. Can you see the tall towers?
Early Reader · Change the reading level on the articleNuclear reactor
A reactor makes heat. It uses special fuel. This fuel makes lots of energy. We use this to make light. It helps us every day. Can you imagine that?
Early Reader · Change the reading level on the articleNuclear weapon design
Some bombs use very tiny parts. These parts make a big blast. They use heat to work. This can be very strong. It is a serious thing. Do you want to learn more?
Early Reader · Change the reading level on the articleNumerical relay
A smart tool helps keep power safe. It watches the wires. It looks for problems. If there is a mistake, it stops the power. This keeps things working well. Can you see how it helps?
Early Reader · Change the reading level on the articleNurek Dam
A big wall holds back a river. It is in a land called Tajikistan. This wall makes power for homes. It uses water to make light. The wall is very, very tall. Do you like big walls?
Early Reader · Change the reading level on the articleNvidia
Nvidia is a big tech company. It makes parts for computers. These parts help make video games look great. They also help smart machines work. This helps us use new tools. Do you like playing games?
Early Reader · Change the reading level on the articleOar
An oar helps a boat move. It is a long pole. One end is flat. You hold the other end. You pull it to go fast. It is fun to use! Do you like boats?
Early Reader · Change the reading level on the articleObfuscation (software)
People write code for computers. Sometimes, they hide how it works. They make the code hard to read. This is like a puzzle. It can keep things safe. Do you like hard puzzles?
Early Reader · Change the reading level on the articleObject code
Computers use special code to work. This code tells the machine what to do. It is made by a tool. Then, it joins with other parts. This makes a whole program. It helps your computer run. Do you like computers?
Early Reader · Change the reading level on the articleObjective-C
People use code to talk to computers. This special code helps make apps. It was made a long time ago. It helps Apple computers work well. Do you like using apps?
Early Reader · Change the reading level on the articleOcean liner
An ocean liner is a big ship. It carries people across the sea. It travels on a set path. These ships are very strong. They can sail through big waves. They help us reach far places. Do you like big ships?
Early Reader · Change the reading level on the articleOctant (instrument)
An octant helps sailors find their way. It uses mirrors to see things. You can see the sun and the sea at once. This helps you know where you are. It is a very smart tool. Do you like to explore?
Early Reader · Change the reading level on the articleOctave Chanute
Octave Chanute helped people fly. He built big bridges for trains. He also made gliders with many wings. These gliders helped the Wright brothers fly. His work helped us travel in the sky. Do you like to fly?
Early Reader · Change the reading level on the articleOder–Havel Canal
This is a long path for boats. It is in a place called Germany. It helps boats move from one place to another. It is very wide. It is a big way for ships to go. Can you see the boats?
Early Reader · Change the reading level on the articleOdometer
An odometer tells how far you go. It is in many cars. It works on bikes too. It helps us know the way. It is a neat tool. Do you like to ride in a car?
Early Reader · Change the reading level on the articleOff-road vehicle
Some cars can go where roads are not. They drive on dirt and sand. They have big wheels to help them move. These cars are very strong. They help us explore the world. Do you want to go for a ride?
Early Reader · Change the reading level on the articleOgg
Ogg is a way to save files. It can hold music and movies. It can also hold words on a screen. This helps us watch and listen. It is free for everyone to use. Do you like to listen to music?
Early Reader · Change the reading level on the articleOhio-class submarine
These are very big boats. They live deep in the sea. They are very quiet. These boats help keep us safe. They stay underwater for a long time. Do you like the ocean?
Early Reader · Change the reading level on the articleOil lamp
An oil lamp makes light. It uses oil to burn. A small string sits in the oil. We light the string to see. It helps us in the dark. Do you like bright lights?
Early Reader · Change the reading level on the articleOil platform
An oil platform is a big tool. It sits in the sea. It gets oil from deep under the water. This helps us get fuel. It is very large. Do you like big ships?
Early Reader · Change the reading level on the articleOil tanker
Big ships carry oil. They move it across the sea. These ships are very large. They help us get what we need. It is a big job! Do you like big ships?
Early Reader · Change the reading level on the articleOld media
Long ago, people used books and radio. These helped us hear news. They helped us learn new things. They were ways to share stories. Do you like to read books?
Early Reader · Change the reading level on the articleOLED
Some screens make their own light. They use special thin layers. These layers glow when power flows through them. This helps your phone and TV look bright. It makes colors look very good. Do you like bright screens?
Early Reader · Change the reading level on the articleOle Kirk Christiansen
A man made toys. He lived in a place called Denmark. He used wood to make them. Now we have plastic bricks. These toys help us play well. Do you like to play with toys?
Early Reader · Change the reading level on the articleOliver Winchester
Oliver Winchester was a man who made things. He started by making clothes. Then he made tools for shooting. These tools helped people move west. He was a leader in his town. Do you like to make things?
Early Reader · Change the reading level on the articleOnager (weapon)
The onager was a big machine. It threw heavy rocks. It worked like a giant arm. The arm would kick like a wild ass. This helped break down walls. It was very loud and scary. Can you imagine a kicking machine?
Early Reader · Change the reading level on the articleOne-time pad
You can hide a secret message. Use a special code key. This key is a secret. You use it only one time. Then you must burn it. Can you keep a secret?
Early Reader · Change the reading level on the articleOnline advertising
Companies use the internet to show you things. They show ads on websites and phones. These ads show toys or food. They help people find things to buy. It is all around us online. Do you see ads on your screen?
Early Reader · Change the reading level on the articleOnline chat
You can talk to friends online. You can type short notes. You can also see faces on a screen. It is like a real talk. It helps us stay close. Do you like to chat?
Early Reader · Change the reading level on the articleOnline magazine
You can read magazines on a computer. They live on the web. You do not need paper or ink. This helps them cost less. They are fun to read. Do you like reading on a screen?
Early Reader · Change the reading level on the articleOnline shopping
You can buy things on a computer. You look at pictures of toys or clothes. Then you pay with a card. The store sends the items to your home. It is easy to shop this way. Do you like to shop online?
Early Reader · Change the reading level on the articleOnline streamer
Some people show things on the web. They play games for us to see. They also show their daily lives. You can watch them on a screen. It is fun to watch. Do you like to watch videos?
Early Reader · Change the reading level on the articleOpen Database Connectivity
Computers use tools to find data. One tool helps many programs talk. It works like a bridge. It helps a program find files. This makes work fast and easy. Do you like using computers?
Early Reader · Change the reading level on the articleOpen-end spinning
Machines make yarn for clothes. They spin soft bits into long strings. This is very fast. It helps make things like towels. It is a smart way to work. Do you like soft clothes?
Early Reader · Change the reading level on the articleOpenGL
Computers use special tools to draw. These tools help make pictures. They make games look real. They help show 3D shapes on a screen. This helps you see cool things. Do you like computer games?
Early Reader · Change the reading level on the articleOpen-pit mining
People dig big holes in the ground. They look for rocks and metals. These rocks are near the top. We use them to make things. It is a very big job. Do you like looking at big holes?
Early Reader · Change the reading level on the articleOpen source
People can share computer plans. Anyone can see them. You can change them too. This helps everyone learn. It helps us make new things. Do you like to share your toys?
Early Reader · Change the reading level on the articleOperator overloading
Computers use signs like plus. These signs can do more than one thing. A sign can add numbers. It can also join words together. This helps people write code fast. It makes math easy. Do you like math?
Early Reader · Change the reading level on the articleOptical coating
Tiny layers go on glass. They change how light hits things. Some layers stop bright glares. They help you see through glasses. Other layers make very shiny mirrors. It is like magic! Do you see shiny things?
Early Reader · Change the reading level on the articleOptical computing
Computers can use light to work. Light can move very fast. It can help us do math. This can make computers better. Do you like bright lights?
Early Reader · Change the reading level on the articleOptical isolator
Some tools let light go one way. The light can only move forward. It cannot turn back. This helps lasers stay safe. It is a very smart tool. Do you like bright lights?
Early Reader · Change the reading level on the articleOracle Corporation
Oracle is a big tech company. It makes tools for computers. These tools help businesses work. They keep lots of facts safe. It is a very large company. Do you use computers too?
Early Reader · Change the reading level on the articleØresund Bridge
A big bridge joins two lands. It carries cars and trains. It goes over the sea. This helps people travel fast. It is a very long bridge. Can you see the trains?
Early Reader · Change the reading level on the article