Guard rail
A guard rail is a strong bar. It keeps us safe. It stops us from falling. It stays near stairs or hills. It helps us walk. Do you see rails near you?
Early Reader · Change the reading level on the articleTechnology articles — Page 42
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 42 of 86
Guccio Gucci
Guccio Gucci made fine things. He made bags from leather. He worked in a big hotel. His shop grew into a big name. Many people know his work. Do you like fine bags?
Early Reader · Change the reading level on the articleGuido van Rossum
Guido van Rossum is a smart man. He made a way for computers to talk. This is called Python. It helps people use computers for many tasks. It is very popular today. Do you like using computers?
Early Reader · Change the reading level on the articleGuillotine
A long time ago, people used a machine. It was very tall. It had a heavy blade at the top. It was used to end lives. This was a sad thing. Do you know about old machines?
Early Reader · Change the reading level on the articleGuinness World Records
Some books list amazing things. They show the biggest or fastest things. These books help us settle arguments. People all over the world read them. It is fun to learn new facts. Can you find a record?
Early Reader · Change the reading level on the articleGun barrel
A gun barrel is a long tube. It is made of strong metal. Air pushes a small part out the front. This part moves very fast. The tube helps it fly straight. Can you see the long tube? It is very strong.
Early Reader · Change the reading level on the articleGunboat
A gunboat is a small boat. It carries big guns. It can go in shallow water. It can go in rivers too. This helps it reach land. It is a very useful boat. Do you like boats?
Early Reader · Change the reading level on the articleGunship
A gunship is a special plane. It has many big guns. These guns fire to the side. The plane flies in a big circle. It helps people on the ground. Do you like planes?
Early Reader · Change the reading level on the articleGunter's chain
This is a long tool. It is a metal chain. It helps people measure land. It tells us how big a field is. This helps people know where to build. Do you like to measure things?
Early Reader · Change the reading level on the articleGuri Dam
A huge wall holds back a big lake. This wall is in a place called Venezuela. It makes power from moving water. This power helps lights turn on in homes. It is a very big thing to see. Do you like big lakes?
Early Reader · Change the reading level on the articleGyrator
A gyrator is a part for circuits. It helps electricity move in new ways. It can make a part act like another part. This helps make small tools. It is very neat! Do you like science?
Early Reader · Change the reading level on the articleHaaretz
This is a news paper. It tells us what is happening. It has been around for a long time. People read it to learn. It is very special. Do you like to read the news?
Early Reader · Change the reading level on the articleHair dryer
A hair dryer blows warm air. It helps dry your hair fast. You can use it to make new styles. It is easy to hold in your hand. It makes your hair look great. Do you like to style your hair?
Early Reader · Change the reading level on the articleHair iron
A hair iron uses heat. It can change your hair. It can make curls. It can make hair straight. Use it with care. Do you like curls?
Early Reader · Change the reading level on the articleHalberd
A halberd is a long tool. It has an axe on top. It also has a sharp point. It has a hook on the back. Soldiers used it in big fights. It helps keep people safe. Do you want to see one?
Early Reader · Change the reading level on the articleHallway
A hallway is a long path. It connects many rooms. It helps you walk from place to place. It must be wide for people in chairs. It also helps us leave fast if there is a fire. Do you see a hallway in your school?
Early Reader · Change the reading level on the articleHamming code
Computers use special codes. These codes fix mistakes. Sometimes a computer gets a wrong bit. These codes find the wrong bit. Then they fix it fast. This helps computers work well. Do you like computers?
Early Reader · Change the reading level on the articleHand cannon
This is a very old gun. It is made of metal. It shoots things out of a tube. It was used a long time ago. It helped people in many lands. Can you imagine the loud noise?
Early Reader · Change the reading level on the articleHandcar
A handcar is a small car. It moves on train tracks. People push it or pump a handle. It helps workers check the tracks. It is a fun way to ride. Do you want to try it?
Early Reader · Change the reading level on the articleHandrail
A handrail is a bar for your hand. It helps you stay safe. You can hold it on stairs. It helps you not fall down. It is good for you. Can you find one today?
Early Reader · Change the reading level on the articleHaneda Airport
Haneda is a big airport in Japan. Many planes fly there. It helps people travel to far places. It is a very busy place. We can fly far away from here. Do you like to fly in planes?
Early Reader · Change the reading level on the articleHanna Reitsch
Hanna was a pilot. She loved to fly in the sky. She flew planes without engines. She also flew a new kind of helicopter. Hanna was very good at flying. She broke many records. Do you like to fly?
Early Reader · Change the reading level on the articleHardware acceleration
Computers do many jobs. Some jobs are very hard. Special parts can help them work fast. These parts do one job well. This helps your computer run great. Do you like fast games?
Early Reader · Change the reading level on the articleHarold Edgerton
Harold used bright lights to take photos. These lights flash very fast. He could see things that move too quick for us. He even saw tiny birds fly. His work helps us see the world. Can you see fast things?
Early Reader · Change the reading level on the articleHarold Harmsworth, 1st Viscount Rothermere
Harold was a man who owned news. He made many big papers. People read them every day. He also liked to see planes fly. He even gave prizes to pilots. Do you like to read the news?
Early Reader · Change the reading level on the articleHarold Ross
Harold Ross made a magazine. It was called The New Yorker. He worked very hard on it. He helped many writers. He wanted it to be fun to read. Do you like to read magazines?
Early Reader · Change the reading level on the articleHarper's Bazaar
This is a fashion magazine. It shows pretty clothes. It has been around for a long time. It started in New York City. It tells stories about style. Do you like looking at clothes?
Early Reader · Change the reading level on the articleHarpoon
A harpoon is a long tool. It looks like a spear. It helps people catch big fish. A rope is tied to it. This helps pull the fish in. It is a very useful tool. Have you ever seen a fishing pole?
Early Reader · Change the reading level on the articleHarry Triguboff
Harry Triguboff builds big homes. He builds many tall buildings. Some of his buildings are very high. He is a very rich man. He helps many people too. Do you like tall buildings?
Early Reader · Change the reading level on the articleHarry Winston
Harry Winston made pretty jewelry. He worked with many bright stones. He was very good at his job. People called him the King of Diamonds. He even gave a blue stone to a museum. Do you like shiny things?
Early Reader · Change the reading level on the articleHartsfield–Jackson Atlanta International Airport
This is a very big airport. It is in a place called Atlanta. Many planes fly here every day. It helps many people travel far away. It is a very busy place! Do you like to fly in planes?
Early Reader · Change the reading level on the articleHarvard Business Review
This is a big magazine. It helps people lead well. It tells us how to work. It has many smart ideas. We can learn from it. Do you want to read it?
Early Reader · Change the reading level on the articleHarvard Mark I
This was a very big machine. It could do math. It used many small parts. It helped people solve hard problems. It was a great tool. Do you like math?
Early Reader · Change the reading level on the articleHarvey S. Firestone
Harvey Firestone made tires. He made tires for cars. He also made tires for wagons. His company is still very big. He was a very busy man. Do you like to ride in a car?
Early Reader · Change the reading level on the articleHash table
Computers use a special list. It helps them find things fast. It works like a phone book. This helps you find what you need. It is very smart! Do you like fast tools?
Early Reader · Change the reading level on the articleHashtag
A hashtag uses the # sign. It helps you find things online. You can search for a topic. It helps us see what people like. It is fun to use. Do you like to use them?
Early Reader · Change the reading level on the articleHaskell
Haskell is a way to talk to computers. It helps people write rules for machines. People use it for work and school. It is a very smart way to work. Do you want to learn more?
Early Reader · Change the reading level on the articleHatchback
A hatchback is a type of car. It has a big door in the back. This door swings up. You can use it to carry things. It helps you fit big toys inside. Do you like cars?
Early Reader · Change the reading level on the articleHBO
HBO is a way to watch shows. It shows movies and fun programs. You can watch it at home. It has many different shows to see. It is very old and famous. Do you like to watch movies?
Early Reader · Change the reading level on the articleHDMI
A special cord helps your TV work. It carries pictures and sound. One cord does both jobs. It plugs into computers and games. This helps you see and hear. Do you see one at home?
Early Reader · Change the reading level on the articleHeadphones
You can wear headphones on your head. They play music just for you. They help you listen without noise. You can use them to hear songs. They can have a wire or not. Do you like to listen to music?
Early Reader · Change the reading level on the articleHealth and usage monitoring systems
Machines use tools to stay safe. These tools check how they work. They help find small breaks. This keeps the machines moving. It helps us fly well. We can stay safe. Do you like fast planes?
Early Reader · Change the reading level on the articleHeap (data structure)
A heap is a special way to sort things. It keeps the best thing at the top. This helps us find it fast. It is very useful for computers. Do you like to stay organized?
Early Reader · Change the reading level on the articleHeapsort
Computers use this to sort things. It puts things in order. It finds the biggest thing first. Then it puts it at the end. It does this over and over. It makes a neat list. Do you like to sort your toys?
Early Reader · Change the reading level on the articleHearst Communications
Hearst is a big company. It makes many things. It owns news and magazines. It also has TV shows. You might see their work on a screen. It is very big! Do you like to read news?
Early Reader · Change the reading level on the articleHeat exchanger
Some tools move heat. They can make things hot. They can also make things cold. This helps us stay warm. It also helps us stay cool. Do you like to stay warm?
Early Reader · Change the reading level on the articleHeathrow Airport
Heathrow is a very big airport. It is in London. Many planes fly there. They go to many far places. It helps people travel the world. Have you ever flown in a plane?
Early Reader · Change the reading level on the articleHeat pump
A heat pump moves heat. It can warm your home. It can also cool it. It moves heat from one place to another. This helps our world. Do you want to feel warm?
Early Reader · Change the reading level on the article