Stretcher
A stretcher helps sick people move. It can have wheels. Some are carried by two people. It keeps people safe. It helps them get to a doctor. Do you see them in movies?
Early Reader · Change the reading level on the articleTechnology articles — Page 75
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 75 of 86
Try related engineering and scientific-investigation activities in Science Lab.
Strike fighter
Some planes do two jobs. They can fight in the air. They can also attack on the ground. This helps them do much work. They are very fast. Can you see them fly?
Early Reader · Change the reading level on the articleStructural analysis
People build big things like bridges. They must be very strong. They hold up heavy cars and wind. We check them to keep us safe. This helps us stay on the road. Do you like big bridges?
Early Reader · Change the reading level on the articleStructural engineering
People build big things. Some things are very tall. Like a big tower. They must stay strong. This helps us stay safe. Do you like big buildings?
Early Reader · Change the reading level on the articleStructured programming
Computers use sets of rules. These rules help them work. One rule tells them to go in order. One rule helps them choose. One rule lets them do things again. This makes the work easy to read. Do you like rules?
Early Reader · Change the reading level on the articleStun grenade
A stun grenade makes a big light. It makes a very loud bang. This helps people stop and look. It is used to distract others. It can still be unsafe. We must be very careful. Do you know a loud sound?
Early Reader · Change the reading level on the articleSubmachine gun
This is a tool for soldiers. It can fire many shots fast. It is smaller than a big gun. Soldiers used it long ago. It helped them in wars. Do you want to see more?
Early Reader · Change the reading level on the articleSubmarine communications cable
Long wires sit on the sea floor. They carry words across the deep water. These wires help us talk to friends far away. They help us use the internet too. It is like a road for information. Can you imagine a wire…
Early Reader · Change the reading level on the articleSubmersible
A submersible is a small boat. It goes deep under the sea. It needs a big ship to help it. People use it to see fish. It is a fun way to explore. Do you want to dive deep?
Early Reader · Change the reading level on the articleSubnet
One big network can be split. It becomes many small groups. These small groups are called subnets. This helps computers find each other. It makes things work well. Do you use a computer?
Early Reader · Change the reading level on the articleSubscription business model
You can pay to use things often. You pay a small amount each time. This can be for books or games. It helps you get things easily. Do you have a subscription?
Early Reader · Change the reading level on the articleSubstation
These places help move power. They change how power flows. This helps it get to your home. It makes sure the power is safe. It is a big job. Do you use power at home?
Early Reader · Change the reading level on the articleSubtractor
Some parts in computers do math. They can take numbers away. This helps the machine work. It is like a tiny brain. It can even borrow numbers. Do you like math?
Early Reader · Change the reading level on the articleSubway (restaurant)
Subway is a place for food. They make big sandwiches. You can pick what goes inside. They have many shops in many lands. It is a very big food group. Do you like sandwiches?
Early Reader · Change the reading level on the articleSubwoofer
A sub is a loud speaker. It makes deep sounds. It makes sounds like big drums. It helps you feel the music. It is very fun. Can you hear the low sounds?
Early Reader · Change the reading level on the articleSüddeutsche Zeitung
This is a big German newspaper. It tells people the news every day. It started a long time ago. Many people read it to learn. It helps us know what is happening. Do you like to read the news?
Early Reader · Change the reading level on the articleSuitcase
A suitcase helps you travel. It holds your clothes. It has a handle to carry it. Some have wheels to roll. This makes travel easy. Do you like to travel?
Early Reader · Change the reading level on the articleSulfur hexafluoride circuit breaker
Big machines keep our lights on. They stop power from flowing too fast. A special gas helps them work. This gas cools down hot sparks. It keeps the power safe for you. Do you use lights at home?
Early Reader · Change the reading level on the articleSunglasses
Sunglasses help your eyes. They keep the sun out. They stop the bright light. This helps you see well. They can be a fun look, too. Do you wear them in the sun?
Early Reader · Change the reading level on the articleSupercapacitor
A supercapacitor holds power. It works faster than a battery. It can charge up very quick. This helps big buses and trains. It is very useful for us. Do you like fast things?
Early Reader · Change the reading level on the articleSupercar
Some cars are very fast. They look very sleek. They can drive like race cars. These cars are special and rare. They are fun to see. Do you like fast cars?
Early Reader · Change the reading level on the articleSuper grid
A super grid is a big power web. It carries power across many lands. It can move wind and sun power to you. This helps our world stay healthy. It is a very smart way to share. Do you like to share with friends?
Early Reader · Change the reading level on the articleSuperheterodyne receiver
A radio picks up sounds. It turns waves into music. It changes the waves to work well. This helps you hear clearly. It is a smart way to listen. Do you like to listen to the radio?
Early Reader · Change the reading level on the articleSupersonic aircraft
Some planes fly very fast. They fly faster than sound. This makes a loud boom. These planes can be jets. They help us learn new things. Do you want to fly fast?
Early Reader · Change the reading level on the articleSupply chain
Things move in a long line. First, people get parts. Then, they make a new thing. Next, trucks move it to stores. This helps you buy what you need. It is like a big team. Do you see things from a chain?
Early Reader · Change the reading level on the articleSup'ung Dam
A big wall holds back a river. It makes power for homes. This wall is very long. It helps people have light. It is a big job. Can you see the water?
Early Reader · Change the reading level on the articleSurface mining
People dig for things in the ground. They move dirt and rock away. This helps them find coal. They use very big machines. This can change the land. It can also change the water. Can you see a big machine?
Early Reader · Change the reading level on the articleSurface-to-air missile
A missile can fly from the ground. It flies up into the sky. It can stop planes or other missiles. This helps keep people safe. It is a very fast tool. Do you want to see it fly?
Early Reader · Change the reading level on the articleSurround sound
Sound can come from all around you. Many speakers play sounds at once. Some are in front of you. Some are behind you. This makes movies feel real. It is like being in the story. Can you hear the sound move?
Early Reader · Change the reading level on the articleSurveillance aircraft
Some planes look from high up. They watch the ground. They can see far away. This helps people stay safe. They use cameras to see. Do you like to look from high up?
Early Reader · Change the reading level on the articleSurveyor's wheel
A wheel helps us find how far to go. You push it along the ground. It rolls and makes a click sound. This helps you count the way. It is a fun tool to use. Can you find a wheel to roll?
Early Reader · Change the reading level on the articleSusan Wojcicki
Susan was a leader for YouTube. She helped many people watch videos. She even helped Google start in a garage. She worked hard to help others. Susan was a very smart woman. Do you like to watch videos?
Early Reader · Change the reading level on the articleSuspension bridge
A suspension bridge hangs in the air. Big cables hold up the road. Tall towers help hold the weight. The road stays level for cars. It is a very cool way to cross water. Can you see the long cables?
Early Reader · Change the reading level on the articleSustainable architecture
People build special houses. These houses help our Earth. They use the sun for power. They also use the wind. This helps keep the air clean. We can live well this way. Do you like sun power?
Early Reader · Change the reading level on the articleSustainable energy
We need energy to live. It helps us cook and see. Some energy is clean. It does not hurt the air. This is good for the Earth. Can you help save energy?
Early Reader · Change the reading level on the articleSUV
Some cars are big and tall. They can drive on rough ground. They sit high off the road. This helps them go far. Many people like these cars. Do you like big cars?
Early Reader · Change the reading level on the articleSvetlana Sorokina
Svetlana is a news worker. She works on TV and radio. She talks to many people. She helps us learn things. She is a teacher too. Do you like the news?
Early Reader · Change the reading level on the articleSVG
Some pictures are made of shapes. These shapes stay clear. You can make them very big. They do not get fuzzy. This helps us see art on screens. Do you like looking at pictures?
Early Reader · Change the reading level on the articleSwather
A farm machine cuts tall crops. It makes long rows on the ground. This helps the plants dry in the sun. It makes work easy for farmers. It is a big, helpful tool. Do you like farms?
Early Reader · Change the reading level on the articleSwept wing
Some planes have wings that slant. These wings go back or forward. They help fast jets fly well. This makes the plane go very fast. It helps us fly in big jets. Do you like fast planes?
Early Reader · Change the reading level on the articleSwift (programming language)
Swift is a way to talk to computers. It helps people make apps. You can use it to make fun games. It is safe and easy to use. It makes work go fast. Do you want to learn to code?
Early Reader · Change the reading level on the articleSwiss Army knife
A Swiss Army knife has many tools. It can open cans. It can also have tiny scissors. The tools fold into the handle. It is very useful to carry. Do you like tools?
Early Reader · Change the reading level on the articleSwitchblade
A switchblade is a small knife. It has a metal blade. A spring pushes the blade out. You just press a button. This helps it open fast. It stays safe in your pocket. Do you like tools?
Early Reader · Change the reading level on the articleSWOT analysis
People use a plan to do well. It looks at what is good. It looks at what is bad. This helps you reach a goal. It helps you make good choices. Can you make a plan too?
Early Reader · Change the reading level on the articleSydney Harbour Bridge
The big bridge is in Sydney. It goes over the water. People use it to drive cars. It also has paths for bikes. The bridge is very tall. It looks like a coat hanger. Do you want to see it?
Early Reader · Change the reading level on the articleSylvester H. Roper
Sylvester Roper made machines. He built early cars. He also made fast bikes. These used steam to go. He was a great maker. Do you like machines?
Early Reader · Change the reading level on the articleSymbian
Symbian was a way for phones to work. It helped many old phones run. It was used by many people. It made phones very smart. Do you like using phones?
Early Reader · Change the reading level on the articleSymmetric-key algorithm
We use a secret code to hide things. You and a friend use the same key. This key locks the message. Then the same key unlocks it. It keeps your secrets safe. Can you keep a secret?
Early Reader · Change the reading level on the article