Reverse engineering
We can learn how things work. We look at a tool. We see its parts. Then we learn its secrets. This helps us make new things. It is like a puzzle! Can you solve a puzzle?
Early Reader · Change the reading level on the articleTechnology articles — Page 68
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 68 of 86
Try related engineering and scientific-investigation activities in Science Lab.
Reverse osmosis
We use a special way to clean water. It uses a thin skin to catch tiny bits. This skin lets clean water through. It stops salt and dirt. This makes water safe to drink. Do you like clean water?
Early Reader · Change the reading level on the articleReverse proxy
A helper server acts like a middle man. It talks to the web for you. It keeps the real web servers safe. This helps websites work fast. It is a smart way to help. Do you like fast websites?
Early Reader · Change the reading level on the articleRevolver
A revolver is a tool. It has a wheel that turns. This wheel holds many small parts. Most have six parts. They spin to move to the next one. This helps it work fast. Can you see the wheel?
Early Reader · Change the reading level on the articleRGBA color model
Computers use colors to make pictures. They use red, green, and blue. They also use a special part to see through. This lets colors look clear or dark. It helps pictures look real. Can you see colors on a screen?
Early Reader · Change the reading level on the articleRhine–Main–Danube Canal
This is a long water path. It connects two big rivers. Large boats carry food and stone on it. It helps things move across the land. It is very long! Do you like big boats?
Early Reader · Change the reading level on the articleRIA Novosti
RIA Novosti is a news group. It is in a city called Moscow. It tells stories to many people. The group has been around for a long time. It helps people hear news. Do you like to hear news?
Early Reader · Change the reading level on the articleRice cooker
A rice cooker makes rice. It is a small machine. It uses heat to cook. It helps you make food fast. It is very helpful. Do you like rice?
Early Reader · Change the reading level on the articleRichard and Maurice McDonald
Two brothers started a food shop. They made food very fast. It was a great way to eat. Many families liked to go there. It helped start a big business. Do you like fast food?
Early Reader · Change the reading level on the articleRichard Arkwright
Richard was a smart man. He made machines to make thread. These machines used water to work. This helped make much more cloth. His work changed how things are made. Do you like making things?
Early Reader · Change the reading level on the articleRichard Branson
Richard Branson starts many businesses. He sells music and flies planes. He even wants to go to space. He works very hard. He helps many people too. Do you want to start a business?
Early Reader · Change the reading level on the articleRichard M. Karp
Richard Karp is a smart man. He studies how computers work. He finds new ways to solve problems. His work helps us use technology. He is a great teacher too. Do you like computers?
Early Reader · Change the reading level on the articleRichard Stallman
Richard Stallman works with computers. He writes code for them. He wants everyone to share their code. This helps people learn and build new things. It is a very kind way to work. Do you like to share with friends?
Early Reader · Change the reading level on the articleRichard Trevithick
Richard was a smart man. He made machines that used steam. These machines could move big trains. They helped people travel far. He was a great inventor. Do you like big machines?
Early Reader · Change the reading level on the articleRichard Warren Sears
Richard Sears sold many things. He sold watches first. Then he sold clothes and tools. He sent books to homes. People could buy things by mail. This helped people on farms. Do you like to shop?
Early Reader · Change the reading level on the articleRideau Canal
The Rideau Canal is a long path of water. It goes from one river to another. Boats use it to travel. It is a very old path. You can ride a boat on it. Do you like to be on the water?
Early Reader · Change the reading level on the articleRifling
Some tubes have lines inside. These lines make things spin. Spinning helps things fly straight. It helps them hit a target. This makes them very good. Do you like to see things spin?
Early Reader · Change the reading level on the articleRigid airship
A big airship flies in the sky. It has a strong frame inside. This frame keeps its shape. It uses special gas to float. This helps it stay up high. It is very big! Have you seen one fly?
Early Reader · Change the reading level on the articleRing spinning
Machines make yarn for clothes. They pull soft bits into thread. The machine spins very fast. This helps make things like shirts. It is a busy job. Do you like wearing soft clothes?
Early Reader · Change the reading level on the articleRio de Janeiro Metro
Trains run under the ground in Rio. They help many people move fast. The trains stay cool inside. This helps when it is hot. It is a great way to travel. Do you like riding trains?
Early Reader · Change the reading level on the articleRio Tinto (corporation)
A big company finds things in the ground. They dig for metal. They find things like iron and copper. These metals help make things for us. It is a very large group. Do you like metal?
Early Reader · Change the reading level on the articleRiver island
River Island makes clothes. They make things for women and men. They also make clothes for kids. You can buy them in a shop. You can buy them online too. Do you like new clothes?
Early Reader · Change the reading level on the articleRivet gun
A rivet gun is a tool. It helps join metal parts. It uses air to hit things. This makes the metal stay tight. It helps build big ships. Can you imagine a loud tool?
Early Reader · Change the reading level on the articleRoad junction
Roads meet at a junction. These spots help us go places. Some roads go over others. This helps cars move fast. We use lights to stay safe. Do you see junctions when you drive?
Early Reader · Change the reading level on the articleRoad roller
A road roller is a big machine. It makes the ground flat. It uses its heavy weight to press things down. This helps make smooth roads for us. It is a very helpful tool. Do you like smooth roads?
Early Reader · Change the reading level on the articleRoad trip
A road trip is a long drive. You travel in a car. You can go to new places. It is fun to see things. You can go with your family. Do you like to ride in a car?
Early Reader · Change the reading level on the articleRobert Bosch
Robert Bosch was a smart man. He made things for cars. He built a tool to help engines run. This tool helps us travel today. He also helped many people. Do you like cars?
Early Reader · Change the reading level on the articleRobert Esnault-Pelterie
Robert was a man who loved planes. He built many planes to fly. He also thought about flying to the moon. His ideas helped us go to space. Do you like to look at the stars?
Early Reader · Change the reading level on the articleRobert Fisk
Robert Fisk was a writer. He went to many far places. He wrote stories about wars. He wanted to tell the truth. His work helped people learn. Do you like to read stories?
Early Reader · Change the reading level on the articleRobert Kahn (computer scientist)
Robert Kahn helped build the internet. He made a way for computers to talk. This helps us use computers today. He worked with a friend to do it. He is a very smart man. Do you use the internet?
Early Reader · Change the reading level on the articleRobert Moog
Bob Moog made new kinds of music. He built tools to make sounds. These tools were small and easy to use. They helped many people make songs. He was a great inventor. Do you like music?
Early Reader · Change the reading level on the articleRobert Tappan Morris
Robert Morris is a computer expert. He made a tiny program that moved through the web. It caused big problems for computers. He learned how to make things better later. He helps many people today. Do you like computers?
Early Reader · Change the reading level on the articleRobotic arm
A robot arm is a machine arm. It can move like your own arm. It can reach for things in space. It can even help build cars. It helps us do hard work. Do you like robots?
Early Reader · Change the reading level on the articleRocket artillery
Rockets can fly through the air. Long ago, people used fire arrows. They could shoot many at once. These tools help people in wars. They make a loud noise. Do you want to see a rocket fly?
Early Reader · Change the reading level on the articleRoger Ailes
Roger Ailes worked on TV. He helped many leaders. He was a boss at a news station. Some people said he was not kind to women. He left his job. Do you like to watch news on TV?
Early Reader · Change the reading level on the articleRoger Béteille
Roger helped build big planes. He worked in France. He helped make a famous company. Many people call him Mister Airbus. He made flying better for us. Do you like planes?
Early Reader · Change the reading level on the articleRogun Dam
A big wall is being built. It sits in a river. This wall will make power. This power helps people. We can use it for light. Do you like bright lights?
Early Reader · Change the reading level on the articleRoland Garros (aviator)
Roland Garros was a pilot. He flew planes in the sky. He was very brave. He helped people fly better. A big tennis place is named for him. Do you like to watch tennis?
Early Reader · Change the reading level on the articleRoland TR-808
This is a drum machine. It makes music sounds. It makes a big, deep boom. You can use it to make beats. Many people use it in songs. It is very famous. Do you like music?
Early Reader · Change the reading level on the articleRoller (agricultural tool)
A roller is a heavy tool. It makes the ground flat. It can break up big lumps of dirt. This helps plants grow. It also makes grass look nice. Do you like flat ground?
Early Reader · Change the reading level on the articleRoller coaster
A roller coaster is a fun ride. It goes on a track. The train goes up and down. It turns in big loops. You can feel a big thrill! Do you like fast rides?
Early Reader · Change the reading level on the articleRoller skates
Roller skates have wheels on the bottom. They help you move on hard ground. You can skate like you are on ice. They are a fun way to play. Do you want to try skating?
Early Reader · Change the reading level on the articleRolling stock
Trains use many kinds of cars. Some cars have engines. Some cars do not. These cars carry people and things. We use them to go places. They move on tracks. Do you like trains?
Early Reader · Change the reading level on the articleRoman Abramovich
Roman is a very rich man. He used to own a football team. He also owns big companies. He lived in Russia. He helps many things grow. Do you like football?
Early Reader · Change the reading level on the articleRoman concrete
Long ago, people used a special mix. It was like a strong rock. It could even get hard under water. This helped them build big bridges. Many of these buildings still stand today. It is very strong! Can you see the…
Early Reader · Change the reading level on the articleRoman roads
Long ago, people built big roads. These roads helped armies move fast. They also helped people trade goods. Some roads were made of stone. They were very straight. Do you like to walk on roads?
Early Reader · Change the reading level on the articleRome Metro
Trains run under the city of Rome. They move people in many ways. There are orange, blue, and green lines. They help us get around the big city. It is a fun way to travel. Do you like trains?
Early Reader · Change the reading level on the articleRoof shingle
Shingles cover a roof. They are flat shapes. They lay on top of each other. This keeps the rain out. They can be made of wood or stone. They keep your home dry. Do you see shingles on a house?
Early Reader · Change the reading level on the article