Prague Metro
Trains run under the ground. They carry many people. The trains have bright colors. You can ride them in the city. It is a fast way to go. Do you like trains?
Early Reader · Change the reading level on the articleTechnology articles — Page 65
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 65 of 86
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Pravda
Pravda is a famous paper. It tells news from Russia. It started a long time ago. Many people read it to learn. It helps us see the past. Do you like to read the news?
Early Reader · Change the reading level on the articlePrecast concrete
People make hard walls in a factory. These parts are moved to a new building. They fit together like blocks. This helps us build fast. It can be used for roads and homes. Do you see big walls like these?
Early Reader · Change the reading level on the articlePreemption (computing)
A computer can do many jobs. It can switch jobs very fast. It stops one job to start another. This helps you do many things at once. It makes your computer feel fast. Do you like playing games and listening to music?
Early Reader · Change the reading level on the articlePrehistoric technology
Long ago, people made tools. They used hard stones to help. These tools helped them find food. They even used fire to cook. This helped people live better. Do you like to use tools?
Early Reader · Change the reading level on the articlePreprint
Scientists write new stories about what they find. They share these stories fast. This helps other people learn. It can also help them fix mistakes. This is a great way to share ideas. Do you like to share what you…
Early Reader · Change the reading level on the articlePress Trust of India
PTI is a big news group. It tells stories from India. Many papers use their news. It helps us know what is happening. We can learn new things. Do you like to read news?
Early Reader · Change the reading level on the articlePress TV
Press TV is a news show. It is from a place called Iran. It shows news to many people. It talks about the world. Some people do not like what it says. Do you watch the news?
Early Reader · Change the reading level on the articlePressure cooker
A pressure cooker is a special pot. It uses hot steam to cook food. This makes the food cook very fast. It helps us save time. It is a great tool for the kitchen. Do you like hot food?
Early Reader · Change the reading level on the articlePressure vessel
A tank can hold air or water. It keeps things inside very tight. This helps us use air or water. It is very strong. We must be careful with them. Can you find a big tank?
Early Reader · Change the reading level on the articlePressurized heavy-water reactor
Some machines make power. They use special water. This water helps the fuel work. It makes heat for us. We use this heat for energy. Can you imagine a big machine?
Early Reader · Change the reading level on the articlePrestressed concrete
Strong concrete helps build big things. We put strong wires inside it. These wires pull tight. This makes the concrete very strong. It helps hold up bridges. It is a smart way to build. Can you see a bridge near you?
Early Reader · Change the reading level on the articlePrimary mirror
A big mirror helps us see stars. It catches light from far away. It can be made of glass. This mirror helps us see the sky. It makes the stars look bright. Can you look at the stars tonight?
Early Reader · Change the reading level on the articlePrint on demand
We can print books as we need them. A machine makes one book at a time. It waits for someone to buy it first. This helps save lots of paper. It is a smart way to work. Do you like to read books?
Early Reader · Change the reading level on the articlePrint syndication
Some groups share news and fun stories. They send drawings to many papers. This helps small papers too. You can read their jokes and news. It is a great way to share. Do you like funny drawings?
Early Reader · Change the reading level on the articlePrismatic blade
Long ago, people made sharp tools. These tools were made from stone. They look like small blades. People used them to cut things. They could even trade the pieces. Do you like looking at old things?
Early Reader · Change the reading level on the articlePrivately held company
Some businesses are private. A small group owns them. You cannot buy a part of them. They help many people work. They are very important. Do you know a small shop?
Early Reader · Change the reading level on the articlePrivate network
Some computers stay in a small group. This group is a private network. It can be in your home. It can be at work. It keeps your things safe. Do you have a computer at home?
Early Reader · Change the reading level on the articlePrivate transport
You can travel in many ways. You can ride a bike. You can drive a car. You can even walk! You pick when to go. It is fun to move around. How do you like to travel?
Early Reader · Change the reading level on the articleProcess (computing)
A computer program is a list of rules. When the computer follows the rules, it is called a process. This is what makes your computer work. It helps you play games or watch music. It can do many things at once. Do you…
Early Reader · Change the reading level on the articleProcess design
People plan how to make things. They pick the best tools. They use maps to show the way. This helps them build big plants. It keeps us safe too. Do you like to plan things?
Early Reader · Change the reading level on the articleProcess engineering
People make many things in big shops. They change wood into paper. They turn things into food or soap. This helps us every day. It is a big job. Do you like making things?
Early Reader · Change the reading level on the articleProcessor (computing)
A computer chip is a tiny brain. It helps the machine work. It follows many rules to do jobs. This chip helps you play games. It is very small and smart. Do you like using computers?
Early Reader · Change the reading level on the articleProcessor register
A computer has tiny spots to hold things. These spots are very fast. They keep things the computer needs right now. This helps the computer work well. It is like a small desk for your tools. Can you find a computer?
Early Reader · Change the reading level on the articleProduct design
People make new things to sell. They think of a good idea. Then they make a model. This helps them see if it works. It can help people every day. Do you have a fun idea?
Early Reader · Change the reading level on the articleProgrammer
People write code for computers. This code tells the computer what to do. It can make games. It can help us work. It is a very cool job. Do you like to play games?
Early Reader · Change the reading level on the articleProject
A project is a big job. You make a plan first. Then you do the work. You might build something new. It has a start and an end. Do you have a big job to do?
Early Reader · Change the reading level on the articleProjection screen
A screen shows big pictures. It can be on a wall. Some screens can roll up. They help us see movies. You can watch a movie at home. Do you like big movies?
Early Reader · Change the reading level on the articleProject management
A team works on a big job. They must follow a plan. They must use the right tools. They must not spend too much money. This helps them finish the work. Do you like to make plans?
Early Reader · Change the reading level on the articleProjector
A projector shows pictures. It shines bright light. This light makes a big image. You can see it on a wall. It is like magic! Do you like big movies?
Early Reader · Change the reading level on the articlePropellant
Things push to move. They push something out the back. This makes them go forward. It works like a rocket. It helps us fly. Can you see it go?
Early Reader · Change the reading level on the articlePropeller
A propeller helps things move. It has blades that spin fast. It can move a boat in water. It can move a plane in the air. This helps us travel far. Do you like to ride in boats?
Early Reader · Change the reading level on the articleProtective relay
Some tools keep our power safe. They watch the wires. If something goes wrong, they act fast. They turn off the power to stop a problem. This helps keep us safe. Do you use power at your home?
Early Reader · Change the reading level on the articleProximity fuze
A special tool helps shells work. It knows when it is near. It does not need to hit. It just gets close. This helps it work well. It was a big secret. Do you like tools that think?
Early Reader · Change the reading level on the articleProxy server
A proxy is like a helper. It sits between two computers. It asks for things for you. This can keep you safe. It can also help things go fast. Do you use a helper at school?
Early Reader · Change the reading level on the articlePublic-key cryptography
Computers use special keys to hide secrets. One key is for everyone to see. The other key stays a secret. This helps keep your messages safe. It is like a magic lock. Can you imagine a secret lock?
Early Reader · Change the reading level on the articlePublic transport bus service
Buses help people move around. They follow a set path. They stop at special spots. You can ride them to school. Many people ride together. It is a fun way to travel. Do you like to ride the bus?
Early Reader · Change the reading level on the articlePulp (paper)
Pulp is a thick mix. It comes from wood. It can also come from old paper. People use it to make new paper. This helps us write and draw. Do you like to draw on paper?
Early Reader · Change the reading level on the articlePump
A pump moves things. It moves water or air. It can move oil too. It helps us get water from a well. It can even help your body. It is very useful! Do you see pumps at home?
Early Reader · Change the reading level on the articlePumped-storage hydroelectricity
We use water to save power. It uses two lakes. One lake is high up. We pump water up when we have extra power. We let it fall down to make more power. This helps us have light when we need it. Can you imagine a giant…
Early Reader · Change the reading level on the articlePunji stick
People used sharp sticks in traps. These sticks were made of wood. They were hidden in holes. The sticks could hurt a person's leg. These traps are now banned. Do you see how they hide?
Early Reader · Change the reading level on the articlePurchasing
Big groups need to buy things. They buy tools and help. They pick the best ones. This helps them do a good job. It is a big task. Do you like to shop?
Early Reader · Change the reading level on the articlePwC
PwC is a very big group. They help people with money. They work in many lands. They have many people on their team. This helps many businesses. Do you like math?
Early Reader · Change the reading level on the articlePython (programming language)
Python is a way to talk to computers. It helps people write new tools. The words look a lot like English. This makes it easy to read. Many people use it to learn. Do you want to learn too?
Early Reader · Change the reading level on the articleQantas
Qantas is a big airline. It flies many planes. These planes go to many lands. It flies to all seven parts of the world. It is very old. People call it The Flying Kangaroo. Do you like to fly in planes?
Early Reader · Change the reading level on the articleQian Xuesen
Qian Xuesen was a smart man. He studied how rockets fly. He helped build many rockets. This work helped people reach space. He was a great leader. Do you like rockets?
Early Reader · Change the reading level on the articleQingdao Jiaozhou Bay Bridge
This is a very long bridge. It goes over the water. It helps cars travel fast. It is in a place called China. It is very strong. Do you like big bridges?
Early Reader · Change the reading level on the articleQR code
A QR code is a square pattern. It has black and white spots. You use a camera to read it. It can show you a website. It helps you find things fast. Have you seen one yet?
Early Reader · Change the reading level on the article