Transport hub
A hub is a busy place. People and things move here. You can catch a bus or a train. It helps us get to new places. We can switch rides at a hub. Have you seen a big station?
Early Reader · Change the reading level on the articleTechnology articles — Page 80
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 80 of 86
Try related engineering and scientific-investigation activities in Science Lab.
Transport Layer Security
Computers use a secret way to talk. It keeps your words safe. This helps hide your mail from others. It works on the web too. It is very good at its job. Do you use the web?
Early Reader · Change the reading level on the articleTravel agency
A travel agency helps you go on trips. They find places for you to stay. They can help you find a car too. This makes your trip easy and fun. Do you want to go on a trip?
Early Reader · Change the reading level on the articleTreadmill
A treadmill helps you move in one place. You can walk or run on it. It has a moving belt under your feet. It helps you stay fit and strong. It is fun to use! Do you like to run?
Early Reader · Change the reading level on the articleTrebuchet
A trebuchet is a big machine. It can throw heavy stones. It uses a long arm to swing. This helps it throw very far. It was used a long time ago. Can you imagine a machine that big?
Early Reader · Change the reading level on the articleTree (abstract data type)
Computers use a special kind of tree. It is not a real tree. It helps computers keep things in order. One part sits at the top. Other parts hang below it. It helps us find things fast. Can you find a tree in your house?
Early Reader · Change the reading level on the articleTrench
A trench is a long, deep hole. It is narrow and long. People dig them for water pipes. They also dig them to find old things. These holes help us every day. Have you ever seen a long hole in the ground?
Early Reader · Change the reading level on the articleTricycle
A trike has three wheels. It helps you stay steady. It does not tip like a bike. You can ride it for fun. It is a great way to go fast. Do you want to ride one?
Early Reader · Change the reading level on the articleTrident
A trident has three points. It looks like a big fork. People use it to catch fish. It is also used in old stories. Some sea gods hold one. Do you like stories about the sea?
Early Reader · Change the reading level on the articleTrigger (firearms)
A trigger is a small lever. You push it with your finger. It lets out a lot of energy. This makes a tool or a gun work. It is a very smart part. Do you know what else has a trigger?
Early Reader · Change the reading level on the articleTrim tab
A trim tab is a small part. It sits on a plane or boat. It helps the pilot stay steady. This means you do not have to pull hard. It makes flying much easier. Can you see the small part?
Early Reader · Change the reading level on the articleTrip hammer
A trip hammer is a big hammer. It can crush rocks. It can also pound grain for food. Water helps move the hammer. This helps people do hard work. It is very strong. Do you want to see it work?
Early Reader · Change the reading level on the articleTrip Hawkins
Trip Hawkins makes video games. He started a big game company. He loved to play football games. Now, he makes games for kids. His games help us be kind. Do you like to play games?
Early Reader · Change the reading level on the articleTrireme
This was a fast boat. It had three rows of oars. Many men pulled the oars to move it. It helped people travel on the sea. It was very strong. Do you like big boats?
Early Reader · Change the reading level on the articleTrojan horse (computing)
Some computer programs act like tricks. They look like good tools. But they hide bad things inside. They can steal your secrets. Be careful what you click! Have you seen a trick before?
Early Reader · Change the reading level on the articleTrolleybus
A trolleybus is a big bus. It uses wires to move. Two long poles touch the wires. These poles give the bus power. This helps the bus go. It is very quiet. Have you seen one?
Early Reader · Change the reading level on the articleTrollhätte Canal
This is a long path for boats. It is in a place called Sweden. The water helps big ships move. It connects a river to a lake. This path is very old. Do you like to see boats on water?
Early Reader · Change the reading level on the articleTrommel screen
A big drum spins around. It has many tiny holes. Small things fall through the holes. Big things roll out the end. This helps sort trash or food. It is a busy machine! Can you see it spin?
Early Reader · Change the reading level on the articleTrowel
A trowel is a small tool. You can use it to dig. It helps you move mud or dirt. It can also make things smooth. It is very helpful for work. Do you like to dig in the dirt?
Early Reader · Change the reading level on the articleTRS-80
This is an old computer. It sits on a desk. People used it for work and fun. It helped many people learn. It was a very big deal. Do you like computers?
Early Reader · Change the reading level on the articleTruck driver
Truck drivers drive big trucks. They move things on the road. They carry food and toys. This helps all of us. It is a big job. Do you like big trucks?
Early Reader · Change the reading level on the articleTruss bridge
A truss bridge is a strong bridge. It uses many straight parts. These parts make triangles. Triangles help the bridge stay strong. This helps us cross water. Can you see a triangle bridge?
Early Reader · Change the reading level on the articleTsar Bomba
A long time ago, people made a very big bomb. It was the strongest bomb ever. It was made in a place called the Soviet Union. The bomb was very, very large. It was much bigger than other bombs. Can you imagine…
Early Reader · Change the reading level on the articleTSMC
This company makes tiny computer parts. These parts go in phones. They also go in big computers. Many people use them every day. They help our tools work well. Can you name a gadget that uses a chip?
Early Reader · Change the reading level on the articleT-square
A T-square is a tool for drawing. It looks like the letter T. It helps you draw straight lines. People use it to build things. It helps make work look good. Do you like to draw straight lines?
Early Reader · Change the reading level on the articleT-top
A T-top is a car roof. It has two parts you can take off. A bar stays in the middle. This lets you feel the air. It is fun to ride in. Do you like cars with open roofs?
Early Reader · Change the reading level on the articleTugboat
A tugboat is a strong boat. It helps big ships move. It can push or pull them. This helps in small spots. These boats work very hard. Do you like big boats?
Early Reader · Change the reading level on the articleTumblr
Tumblr is a place to share things. You can post pictures and words. It is a way to talk to friends. You can see what they like. It is a fun place to be. Do you like to share things?
Early Reader · Change the reading level on the articleTunable metamaterial
Some special things can change. They can change how light moves. We can make light bounce or go through. This helps us work with light. It is very cool! Do you like light?
Early Reader · Change the reading level on the articleTuner (radio)
A tuner finds radio songs. It picks one station from the air. You can turn a knob to find it. This helps you hear music. It can even help you watch TV. Do you like to listen to the radio?
Early Reader · Change the reading level on the articleTunnel boring machine
A big machine digs tunnels. It can go through rock. It can go through sand too. This helps us make roads under the ground. It is a very strong tool. Can you imagine a giant machine digging a hole?
Early Reader · Change the reading level on the articleTunnel construction
People build tunnels underground. Some are made in a deep ditch. Then they are covered up. Big machines can also dig holes. These tunnels help us travel. They are very cool! Do you like tunnels?
Early Reader · Change the reading level on the articleTupolev Tu-154
This is a big plane. It carries many people. It can land on bumpy ground. This helps people fly in cold places. It is a very strong plane. Do you like to fly in planes?
Early Reader · Change the reading level on the articleTurbofan
A fan engine helps planes fly. It uses big fans to push air. This push moves the plane forward. It helps planes use less fuel. This is very good for us. Have you seen a big plane?
Early Reader · Change the reading level on the articleTurbojet
A jet engine helps planes fly fast. It pulls in air. Then it makes the air hot. The hot air shoots out the back. This push makes the plane go. Can you imagine flying that fast?
Early Reader · Change the reading level on the articleTurboprop
A turboprop is a plane engine. It uses a big fan to move. This fan helps the plane fly. It works well when planes go slow. This helps save fuel. Do you like planes?
Early Reader · Change the reading level on the articleTurboshaft
This engine makes power. It turns a rod to make things move. It helps big boats and helicopters fly. It is small and light. This helps us move fast. Do you like big machines?
Early Reader · Change the reading level on the articleTuring test
Can a machine think? A man named Alan Turing had an idea. He made a game. A person asks questions to a machine. They also ask a person. If you cannot tell who is who, the machine wins! It acts just like us. Can you…
Early Reader · Change the reading level on the articleTurkish Airlines
Turkish Airlines flies many planes. They fly to many lands. They go to many countries. This helps us see the world. It is a big job. Do you like to fly?
Early Reader · Change the reading level on the articleTV Globo
TV Globo is a big TV station. It is in a place called Brazil. It shows news and fun shows. Many people watch it on their TVs. It helps us see the world. Do you like to watch TV?
Early Reader · Change the reading level on the articleTweezers
Tweezers are small tools. They help us grab tiny things. Your fingers might be too big. They can pick up small bits. They are very helpful. Do you use them at home?
Early Reader · Change the reading level on the articleTwin-lens reflex camera
This camera has two lenses. One lens helps you see. The other lens takes the picture. You look down to see the view. It is easy to hold. Do you like taking photos?
Early Reader · Change the reading level on the articleTwitch (service)
Twitch is a place for video. People watch games on it. You can see music too. It is fun to watch. It helps people play together. Do you like to play games?
Early Reader · Change the reading level on the articleTwo-stroke engine
A small engine helps things move. It has a part that goes up and down. It goes up and down just two times. This makes it very strong and light. You might see it in a leaf blower. Do you like fast machines?
Early Reader · Change the reading level on the articleType conversion
Computers use different kinds of info. Sometimes they change one kind to another. This helps them work well. It can happen all by itself. Or you can tell them to do it. It is very smart! Can you think of a way to…
Early Reader · Change the reading level on the articleTypesetting
People make books with letters. They pick small metal bits. Each bit has one letter. They put them in a row. Then they use ink to print. This makes the words on paper. Do you like to read books?
Early Reader · Change the reading level on the articleTypographic unit
People use small tools to measure letters. These tools help make books. They make sure words fit on a page. This helps us read well. It is very neat! Do you like to read books?
Early Reader · Change the reading level on the articleUber
Uber helps people get rides. You can use a phone to call a car. It can also bring food to you. It helps many people every day. It is a big company. Do you like to ride in cars?
Early Reader · Change the reading level on the article