RCA Records
RCA Records makes music. It makes many kinds of songs. You can hear pop or rock. You can hear jazz too. Music helps us feel happy. Do you like to dance to music?
Early Reader · Change the reading level on the articleTechnology articles — Page 67
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 67 of 86
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Reactive armour
Some tanks have special armor. It helps keep them safe. When something hits the tank, the armor pushes back. This helps stop the hit. It is very smart. Do you want to see a tank?
Early Reader · Change the reading level on the articleReader's Digest
This is a magazine. It has many stories. People read it in many lands. It helps you learn new things. It is fun to read. Do you like stories?
Early Reader · Change the reading level on the articleReady-mix concrete
Big trucks bring wet stone to us. They mix sand, water, and rocks. This mix makes strong walls. It helps us build big bridges. It is ready to use right away. Do you like big trucks?
Early Reader · Change the reading level on the articleReal estate development
People build new places to live. They buy land first. Then they plan and build houses. This helps us have more homes. It is hard work to do. Do you like new buildings?
Early Reader · Change the reading level on the articleReal-time clock
Some machines have a tiny clock inside. It tells the machine what time it is. It works even when the power is off. This helps the machine stay on track. It is a very smart tool. Do you use a clock every day?
Early Reader · Change the reading level on the articleReal-time computing
Some computers must work very fast. They must do a job right away. This helps cars and planes stay safe. If they are slow, things might break. It is good to be quick! Do you like fast things?
Early Reader · Change the reading level on the articleReal-time operating system
Some machines must work very fast. They must do things right on time. They do not wait for anything. This helps them stay safe. It is like a fast race. Can you be a fast runner?
Early Reader · Change the reading level on the articleReaper
A reaper is a farm tool. It cuts tall grass. It helps get food. It makes work fast. We use it to harvest. Do you like farms?
Early Reader · Change the reading level on the articleReaper-binder
A binder helps on a farm. It cuts the plants. Then it ties them in bundles. This makes work easy for us. It is a helpful tool. Do you like farms?
Early Reader · Change the reading level on the articleRebar
Metal bars go inside concrete. They make the concrete very strong. This helps big buildings stay up. They help when things pull on the walls. It keeps us safe. Do you see metal in buildings?
Early Reader · Change the reading level on the articleRebekah Brooks
Rebekah Brooks works with news. She was a boss for big papers. She had a hard time at work. People were very upset with her. She said she was sorry. Do you like reading the news?
Early Reader · Change the reading level on the articleRechargeable battery
Some batteries can be used many times. You can fill them with power again. They help power your toys and tools. They are good for our world. We can use them over and over. Do you have a battery at home?
Early Reader · Change the reading level on the articleReciprocating engine
An engine makes things move. It uses heat to work. Hot air pushes a part inside. This part moves up and down. This helps cars go fast. Do you like fast cars?
Early Reader · Change the reading level on the articleReconnaissance aircraft
Some planes fly high to look down. They take pictures from the sky. This helps people see far away. They can see things from a long way off. It is like having giant eyes. Do you like to look from high places?
Early Reader · Change the reading level on the articleRecord label
A music label helps singers. It helps people hear new songs. They put music on the radio. They also sell it in stores. This helps many people find music. Do you like to listen to music?
Early Reader · Change the reading level on the articleRecords management
People keep notes of what they do. These notes help us remember. They show what happened and why. We keep them safe in folders. Some notes are kept for a long time. Do you keep notes too?
Early Reader · Change the reading level on the articleRecreational vehicle
An RV is a home on wheels. It can be a van or a trailer. Some have beds and a kitchen. You can sleep and cook inside. It helps you go on trips. Would you like to sleep in one?
Early Reader · Change the reading level on the articleRectifier
A rectifier helps with power. It changes how electricity moves. Some power moves back and forth. The rectifier makes it go one way. This helps our computers work. It is very helpful. Do you use a computer?
Early Reader · Change the reading level on the articleRecumbent bicycle
A recumbent bike is a special bike. You sit back in a seat. It feels like a chair. This helps your back feel good. Some bikes have three wheels. Do you like to ride bikes?
Early Reader · Change the reading level on the articleRecursion (computer science)
A computer can solve big jobs. It breaks them into small jobs. It does this by doing the same thing again. This helps it finish the work. It is a smart way to think. Can you see patterns in nature?
Early Reader · Change the reading level on the articleRed Adair
Red Adair was a brave man. He put out big fires. These fires were at oil wells. He helped many people. He was a hero. Do you like heroes?
Early Reader · Change the reading level on the articleRed–black tree
Computers use special trees to find things. These trees use red and black colors. The colors help keep the tree even. This helps the computer work fast. It helps you find things quickly. Do you like the color red?
Early Reader · Change the reading level on the articleRed Bull
Red Bull is a bubbly drink. It comes in a can. Many people drink it all over the world. It helps some people feel awake. Have you ever had a bubbly drink?
Early Reader · Change the reading level on the articleReddit is a big website. People share news and fun things. You can see many pictures. You can read what others say. People vote on what they like. This helps the best things stay at the top. Do you like to read news…
Early Reader · Change the reading level on the articleRed Flag Canal
This is a long path for water. It winds around a big cliff. People dug it all by hand. It helps water reach many farms. It is a very big job. It was done a long time ago. Do you like to help?
Early Reader · Change the reading level on the articleReed Hastings
Reed Hastings helps us watch movies. He started a company called Netflix. It sends movies to your home. It also lets you watch shows on a screen. He likes to help kids learn. Do you like to watch movies?
Early Reader · Change the reading level on the articleRefrigerant
A special liquid helps keep things cool. It moves heat away. It takes heat from inside a fridge. Then it moves heat outside. This keeps your food cold. It also keeps you cool. Can you feel a cool breeze?
Early Reader · Change the reading level on the articleReginald Fessenden
Reginald was a smart man. He made new ways to talk. He sent voices through the air. This helped people far away. It was a big deal. Can you hear the radio?
Early Reader · Change the reading level on the articleRegular expression
Computers use patterns to find words. These patterns help search for things. You can find a word fast. It helps us fix mistakes in text. It is a very smart tool. Do you like to search for things?
Early Reader · Change the reading level on the articleReinforced concrete
Strong buildings use a special mix. We put metal bars inside the mix. This makes it very strong. It helps hold up big walls. It helps keep us safe. Do you see big buildings near you?
Early Reader · Change the reading level on the articleRemotely operated underwater vehicle
This is a robot for the sea. It swims deep in the water. People use it to see the ocean. It helps us find old ships. It can do work too. Do you want to explore the sea?
Early Reader · Change the reading level on the articleRenaissance technology
Long ago, people made new tools. They made a big machine to print books. This helped many people learn to read. They also made tools to help boats move. These tools changed the world. Do you like to learn new things?
Early Reader · Change the reading level on the articleRenault
Renault makes many kinds of cars. They make cars and vans. They also make big trucks. This helps people get around. It is a very old company. Do you like cars?
Early Reader · Change the reading level on the articleRenfe
Renfe is a train company. It runs trains in Spain. Some trains go very fast. They carry people to new places. This helps us travel. Do you like trains?
Early Reader · Change the reading level on the articleRen Zhengfei
Ren Zhengfei is a busy leader. He started a big company. It makes things to help us talk. He worked very hard for it. He even lived in his factory! Do you like to build things?
Early Reader · Change the reading level on the articleRepeating crossbow
This is a special bow. It can shoot many arrows fast. One hand moves a lever to load it. It helps people protect their homes. It is very cool! Do you like old tools?
Early Reader · Change the reading level on the articleRepeating firearm
Some guns can fire many times. They hold extra shots inside. This helps them work fast. You do not have to stop to load. It is very quick! Do you like fast things?
Early Reader · Change the reading level on the articleRepowering
We can fix old power plants. We can add new parts to them. This helps make more power for us. It also helps save money. It is a smart way to work. Do you like new things?
Early Reader · Change the reading level on the articleRequirements analysis
People make new things. They must plan first. They ask what people need. They write it all down. This helps them build it right. Do you like to plan things?
Early Reader · Change the reading level on the articleResearch and development
People work to make new things. They build new tools. They make new toys. This helps us every day. It can be hard work. Do you want to build something new?
Early Reader · Change the reading level on the articleRéseau Express Régional
Trains help people travel in Paris. They go from the city to far places. Some tracks are deep under the ground. These fast trains help us get around. They are very useful. Do you like riding trains?
Early Reader · Change the reading level on the articleResidual-current device
A special tool keeps us safe. It watches the power in our wires. If the power leaks out, it stops. This helps prevent a bad shock. It works very fast. It is a smart helper. Can you find one in your home?
Early Reader · Change the reading level on the articleRespirator
A mask helps us breathe safe air. It stops bad dust and gas. This keeps our lungs clean. It helps people stay well. It is a smart tool. Do you know anyone who wears one?
Early Reader · Change the reading level on the articleRest area
A rest area is a place to stop. It is next to big roads. You can eat food there. You can also get gas for your car. It helps you stay safe on trips. Do you like to stop on trips?
Early Reader · Change the reading level on the articleReticle
A reticle is a set of lines. It helps you see things clearly. It can look like a small cross. These lines help people aim or measure. It is a very handy tool. Do you like to look through a lens?
Early Reader · Change the reading level on the articleReusability
You can use parts again. Think of small blocks. You use them to build big things. This helps us make new tools. It makes work much easier. Do you like to build things? It is a smart way to work.
Early Reader · Change the reading level on the articleReuters
Reuters tells news to the world. They write stories in many ways. Many people read their news. It helps us know what is happening. They work in many places. Do you like to read news?
Early Reader · Change the reading level on the article