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 37 of 86
Computers use names for files. A name has a small part at the end. This part has a dot before it. It tells us what the file is. It helps us find the right tool to open it. Do you use a computer?
Early Reader · Change the reading level on the articleYou can share things on a computer. You can send a song or a book. It can go through the web. This helps us work together. It is a fun way to learn. Do you like to share things?
Early Reader · Change the reading level on the articleComputers can share files. One computer sends a file to another. It can send a picture or a note. This helps us share things. It is very fast. Do you like to share files?
Early Reader · Change the reading level on the articleA filing cabinet holds your papers. It has many drawers. You can pull them out. It keeps things neat and safe. It helps you find things fast. Do you have papers at home?
Early Reader · Change the reading level on the articleThis is a tiny part. It helps tools work. It uses thin plastic and metal. It is inside many things we use. It helps us every day. Do you see any tools nearby?
Early Reader · Change the reading level on the articleA film studio makes movies. It is a big place for films. Some studios have big walls. They have rooms to make movies. They help us see stories. Do you like movies?
Early Reader · Change the reading level on the articleFins help animals move. They help fish swim in water. Fins also help them turn. Fins can even help them stay steady. They are very useful. Do you like to swim?
Early Reader · Change the reading level on the articlePapers show how a business does. They show money coming in. They show money going out. This helps people make good plans. It helps a business grow. Do you like to keep track of your coins?
Early Reader · Change the reading level on the articleThis is a news paper. It talks about money and business. It is often a pink color. People read it on screens too. It helps us learn about the world. Do you like to read news?
Early Reader · Change the reading level on the articleA fire alarm helps keep us safe. It hears smoke or heat. It can also be pulled by a person. Then, it makes a loud sound. It might also show a bright light. This tells us to go outside. Can you hear a loud alarm?
Early Reader · Change the reading level on the articleSome bricks can stay very hot. They go inside big fires. They do not melt. These bricks help keep heat in. They are very useful. Do you like warm fires?
Early Reader · Change the reading level on the articleA fire engine is a big truck. It carries water to fires. It also carries tools and people. The truck has bright lights. It has a loud siren too. This helps people see it. Have you seen a fire truck?
Early Reader · Change the reading level on the articleFirefox is a tool for the web. It helps you see pages. You can use it on a phone. It also works on computers. It is a very fast tool. Do you use it to look at things?
Early Reader · Change the reading level on the articleA fire hydrant is a tool. It helps firefighters. They use it to get water. This water puts out fires. It keeps us safe. It is very helpful. Do you see one near your home?
Early Reader · Change the reading level on the articleLong ago, people used fire lances. They were tubes on long poles. They shot fire and small bits. This helped people in battles. These tools helped make guns. Can you imagine the bright light?
Early Reader · Change the reading level on the articleA firewall is a digital wall. It keeps computers safe. It checks things coming in. It stops bad things. This helps you stay safe online. It works like a guard. Do you like to stay safe?
Early Reader · Change the reading level on the articleWood can be used for fire. It helps us stay warm. We can use it to cook food. It is good to use dry wood. Dry wood burns much better. Do you like warm fires?
Early Reader · Change the reading level on the articleA small part helps things go pop. It is a tiny metal rod. It hits a small spot on a shell. This makes the shell work. It is a very fast hit! Can you imagine a tiny tap?
Early Reader · Change the reading level on the articleMachines have special rules inside. These rules help them work. They tell a car or a phone what to do. This helps them stay smart. It is like a tiny brain. Can you find a machine with a tiny brain?
Early Reader · Change the reading level on the articleThis knot joins two lines together. It is very strong. People use it for fishing. It can also help climbers. This knot helps keep things safe. Do you like to tie knots?
Early Reader · Change the reading level on the articleA hatchery is a special home. It helps baby fish grow. People take care of them there. This helps us have more fish to eat. It also helps wild fish stay safe. Do you like fish?
Early Reader · Change the reading level on the articleA fish hook helps you catch fish. It is tied to a long line. You put food on the hook. The fish swims up to eat it. Then the hook stays in the fish. Do you like to fish?
Early Reader · Change the reading level on the articleA fishing line is a thin rope. It helps you catch fish. You use a hook to grab them. Then you pull the fish in. It is very long and strong. Do you want to go fishing?
Early Reader · Change the reading level on the articleA fishing net is a tool. It catches fish in the water. It has many small holes. These holes trap the fish. People have used them for a long time. Can you see a net?
Early Reader · Change the reading level on the articleA fishing reel helps you fish. It holds the long fishing line. You turn a handle to wind it. This helps you catch fish. It is a fun tool to use. Do you like to fish?
Early Reader · Change the reading level on the articleA fishing rod is a long stick. It helps you catch fish. You use a line and a hook. The line can have food on it. This helps the fish come near. It is fun to use. Do you like to fish?
Early Reader · Change the reading level on the articleA weir is a fish trap. It can be made of stone. It can be made of wood. It helps catch fish in rivers. People have used them for a long time. Do you like to fish?
Early Reader · Change the reading level on the articlePeople use traps to catch fish. Some traps stay in the water. Some traps are small pots. They can use food to lure fish in. The fish swim inside. Then they cannot get out. Do you like to fish?
Early Reader · Change the reading level on the articlePeople use flags to talk. They hold flags in the air. Each arm moves in a new way. This shows a letter or a number. It helps ships talk to each other. Can you wave a flag?
Early Reader · Change the reading level on the articleA flail is a tool. It has a handle and a stick. Farmers swing it at grain. This helps get the food out. It is a very old tool. Do you want to see it work?
Early Reader · Change the reading level on the articleA flail is a tool for hitting. It has a long handle. A heavy part hangs from a rope or chain. It can hit around a shield. People used them a long time ago. Have you ever seen a tool like this?
Early Reader · Change the reading level on the articleA flamethrower shoots a jet of fire. It can be carried on a back. It can also be on a tank. It helps people burn things in a safe way. Do you think fire is hot?
Early Reader · Change the reading level on the articlePlanes have parts on their wings. These parts are called flaps. They help a plane fly slow. This helps the plane land safely. They also help the plane take off. Do you like to fly in planes?
Early Reader · Change the reading level on the articleA flashlight is a small lamp. You can hold it in your hand. It uses a battery for power. It helps you see in the dark. It is very handy to have! Do you have a flashlight?
Early Reader · Change the reading level on the articleFlash memory helps us save things. It is in phones and cameras. It keeps your pictures safe. It does not break if you move it. It is very helpful! Can you find it in your home?
Early Reader · Change the reading level on the articleA flash makes a quick burst of light. It helps you see in the dark. It can also catch fast things in a photo. This is very helpful for us. Do you like taking bright photos?
Early Reader · Change the reading level on the articleA flatbed truck has a flat back. It has no roof or sides. This helps move big things. It can carry heavy metal or wood. It helps us move things we need. Have you seen a big truck?
Early Reader · Change the reading level on the articleA flat engine is very low. It sits flat like a floor. The parts move side to side. This helps the car stay steady. It does not shake much. It is in some planes and cars. Do you like fast cars?
Early Reader · Change the reading level on the articleThese are small metal darts. They look like tiny arrows. They fall fast from planes. They can even pierce metal. These darts are used in wars. Do you see how sharp they are?
Early Reader · Change the reading level on the articleSmall fins go on arrows. They are made of feathers. They can also be made of plastic. These fins help arrows fly straight. They stop the arrow from tumbling. It is fun to watch them fly! Can you see an arrow fly?
Early Reader · Change the reading level on the articleThis tool helps things spin. It is a long, bendy wire. It can turn even when it bends. It helps a tool spin in your hand. It is used by doctors too. Do you like tools that bend?
Early Reader · Change the reading level on the articlePlanes have parts that move. These parts help the pilot steer. They move the air to turn the plane. This keeps the plane steady in the sky. It helps us fly safely. Can you see the moving parts?
Early Reader · Change the reading level on the articlePilots use tools to fly planes. These tools show how fast the plane goes. They show how high the plane is. They also show which way to go. This helps keep the pilot safe. Do you want to fly a plane?
Early Reader · Change the reading level on the articleA plane has a smart computer. It helps the pilot fly. It knows the way to go. It helps save fuel. It makes flying easier for us. Do you like to fly in planes?
Early Reader · Change the reading level on the articleA flight recorder is a tool. It sits on a plane. It listens to sounds and facts. This helps people learn why things happen. It is bright orange so we can find it. Do you want to see it?
Early Reader · Change the reading level on the articleA flintlock is an old tool. It uses a stone to make sparks. These sparks help it work. It was better than old tools. It was much faster to use. Do you like old things?
Early Reader · Change the reading level on the articleSome tiny parts help computers remember. They can hold one piece of info. They stay that way until we tell them to change. This helps your computer work well. It is like a tiny memory. Do you like computers?
Early Reader · Change the reading level on the articleFlixBus is a big bus company. These buses go to many lands. They help people travel far away. You can ride them to see new places. It is a fun way to go. Have you ever been on a big bus?
Early Reader · Change the reading level on the article