Explore matter, energy, chemistry and the physical laws that help explain everyday life. Choose an article below; its reading controls let you move between the available levels.
2,727 public articles · Page 40 of 57
A moment helps things move. It uses weight and distance. One part is how heavy it is. The other part is how far it is. This helps us balance things. Can you find a lever? It might be a seesaw!
Early Reader · Change the reading level on the articleTiny things move in many ways. We use math to see how they move. This math helps us know where they go. It is like a map for small bits. It helps us see the world. Do you like to see how things move?
Early Reader · Change the reading level on the articleLong ago, people used a moment. It was a tiny bit of time. It was not like our clocks. The sun helped them tell time. It was very interesting to learn. Do you like to watch the sun?
Early Reader · Change the reading level on the articleMonday is a day of the week. It comes after Sunday. Many people call it the Moon's day. This name comes from the Moon in the sky. Do you like Mondays?
Early Reader · Change the reading level on the articleSome crystals have a special shape. They look like a tilted box. Two sides meet at a square corner. The other side is slanted. This shape is very neat. Do you like shapes?
Early Reader · Change the reading level on the articleSmall parts join to make big things. They stick together like blocks. This makes long chains. These chains make things like plastic. They even make the parts in you! It is like a big puzzle. Do you see big things…
Early Reader · Change the reading level on the articleSome things make food taste good. This one is a special salt. It helps food have more flavor. It is safe to eat. It is not like the other kind. Do you like tasty food?
Early Reader · Change the reading level on the articleThis is a special salt. It can melt in water. It tastes a little bit sour. It helps keep blood from clotting. It also helps your body stay healthy. It looks like tiny cubes. Do you like sour things?
Early Reader · Change the reading level on the articleSome food has a special taste. It makes food taste good. You can find it in cheese. It is also in tomatoes. It helps make soup taste yummy. Do you like savory food?
Early Reader · Change the reading level on the articleMorning is the start of the day. It begins when the sun comes up. Then it lasts until noon. We can say "good morning" to friends. It is a nice way to say hello. Do you like the morning?
Early Reader · Change the reading level on the articleSome things do not let power flow. This is called an insulator. They should let power through, but they do not. Tiny bits inside push each other away. This stops the flow. It is very cool! Do you like science?
Early Reader · Change the reading level on the articleA magnet can move a wire. This makes power move. It can help us make tools. It is a big idea. It helps us see how things work. Do you like magnets?
Early Reader · Change the reading level on the articleStanley Whittingham is a smart scientist. He helped make new batteries. These batteries power your phone. They also power cars. He won a big prize for his work. Do you use a phone?
Early Reader · Change the reading level on the articleSome people study how the world works. They think everything is made of tiny strings. These strings might be very small. This helps us see how things move. It is a big mystery. Do you like mysteries?
Early Reader · Change the reading level on the articleMany parts can move together. They can be joined by links. These links help them move in a set way. This helps us build cars and robots. It is how things work. Can you see moving parts?
Early Reader · Change the reading level on the articleA man named Albert made a way to name colors. He used three parts. One part is the color. One part is how light it is. One part is how strong it is. This helps us talk about colors. Do you have a favorite color?
Early Reader · Change the reading level on the articleTiny bits make up our world. Some bits are very small. They have no charge. We can find them in space. They help us learn. Can you imagine something so small?
Early Reader · Change the reading level on the articleWe know how things work. We know things fall down. We know things stay put. Babies know these things too. They watch how things move. Do you watch things move?
Early Reader · Change the reading level on the articleSome things are very, very small. They are too small to see. You cannot see them with your eyes. They are even smaller than a tiny speck of dust. They can be shaped like stars. Can you imagine something that small?
Early Reader · Change the reading level on the articleSome liquids can catch fire fast. This liquid comes from oil. It helps make things like plastic. It can also be fuel for stoves. We must be very careful with it. Do you like to camp in the woods?
Early Reader · Change the reading level on the articleSome things look like white snow. This white stuff has a strong smell. It can keep bugs away from clothes. People used it in mothballs. It helps keep your things safe. Do you know that smell?
Early Reader · Change the reading level on the articleSpace has many big things. The sun and planets pull on each other. This pull makes them move. It is hard to guess where they go. We use math to help us. Do you like looking at the stars?
Early Reader · Change the reading level on the articleSome waves stay close to an antenna. They are in the near field. These waves can change if you move near them. Other waves go very far away. This is the far field. They help us talk from far away. Can you see an antenna?
Early Reader · Change the reading level on the articlePeople made a new kind of stuff. It can bend light in a funny way. It does not work like glass. This helps us make better tools. It is very cool to see. Do you want to see light bend?
Early Reader · Change the reading level on the articleNeon is a special gas. It does not like to join with other things. It stays all by itself. But sometimes, it can get stuck in tiny cages. This can happen under a lot of pressure. Can you find neon in a lamp?
Early Reader · Change the reading level on the articleA man named John Napier lived long ago. We use a name for him in math. It helps us measure things like power. This name is a neper. It is a special way to count. Do you like math?
Early Reader · Change the reading level on the articleTiny bits of power move in liquids. This power helps things work. It changes when things get hot. It also changes with the air. We can use math to find it. Do you like to learn about power?
Early Reader · Change the reading level on the articleForces are pushes or pulls. Many forces can act on one thing. They can push in different ways. All these pushes add up to one big force. This is the net force. It makes things move. Can you feel a push?
Early Reader · Change the reading level on the articleSome things are made of tiny bits. These bits hold hands in a big web. This web makes the thing very hard. A diamond is one of these. It stays strong and tough. Can you find something hard today?
Early Reader · Change the reading level on the articleTiny bits of matter can change. One bit can turn into another. This happens very fast. It helps us learn about space. It is a big mystery. Do you like tiny things?
Early Reader · Change the reading level on the articleTiny bits fly through space. They are very small. These bits can change. They start as one kind. Then they turn into another. This helps us learn about the world. Can you imagine a tiny bit that changes shape?
Early Reader · Change the reading level on the articleTiny bits fly through the air. They can come from big machines. These bits can hit things. They can even change how things work. We use water to stop them. It helps keep us safe. Do you want to learn more?
Early Reader · Change the reading level on the articleNevill Mott was a smart man. He studied how tiny things work. He won a very big prize. This prize was for his work. He helped us learn about metal. Do you like to learn new things?
Early Reader · Change the reading level on the articleScientists use a special drawing. It shows how tiny parts fit. It looks like a dot and a circle. This helps us see how things turn. It makes small things easy to see. Do you like to draw?
Early Reader · Change the reading level on the articleWe can study how things move. We look at how small bits move. This helps us see how the world works. It helps us know where things go. It is very fun to learn. Can you see things moving?
Early Reader · Change the reading level on the articleSome things flow in a steady way. Water and air are like this. They move the same way every time. This helps us know how they work. It is very useful. Do you like to splash in water?
Early Reader · Change the reading level on the articleWe use a special way to measure a turn. It tells us how strong a push is. This helps us turn things like tools. It is a way to talk about force. Can you think of something you turn? We use it every day.
Early Reader · Change the reading level on the articleA push can move things. It can move a ball. It can even move a car. How much it moves depends on the push. The push can last for a short time. We can measure this move. Do you like to kick balls?
Early Reader · Change the reading level on the articleHot things get cold. They lose heat to the air. If the air is cold, they cool fast. If the air is warm, they cool slow. This helps us know how things cool. Do you like warm soup?
Early Reader · Change the reading level on the articleYou can see pretty rings of light. They look like tiny rainbows. They happen between two pieces of glass. A small gap of air is there. These rings are very neat. Can you see the colors?
Early Reader · Change the reading level on the articleNicolaas was a smart man. He studied light. He used lasers to see tiny things. His work helps doctors see inside our bodies. He won a very big prize. Do you like to learn about light?
Early Reader · Change the reading level on the articleScientists made a new thing. It is a tiny part of matter. It does not last long. It goes away in seconds. This is very cool! Can you find it?
Early Reader · Change the reading level on the articleNikolay Basov was a smart man. He studied how light works. He helped make a laser. This light is very special. It helps us do many things. We can learn from his work. Do you like bright lights?
Early Reader · Change the reading level on the articleA man named Nikolay studied air. He wanted to help people fly. He learned how air moves. This helps planes stay up. He is a hero for planes. Do you like to fly?
Early Reader · Change the reading level on the articleSome things are made with air. These things can be very hard. They can even help make blue lights. They help us in many ways. We use them every day. Do you see blue lights?
Early Reader · Change the reading level on the articleSome things help keep meat pink. This helps food stay safe. It is used in ham and bacon. It helps make meat look good. It is a very useful thing. Do you like ham?
Early Reader · Change the reading level on the articleSome things catch fire very fast. This can be used to make shiny paint. It also helps make nail polish. It can even make a bright flash for magic. Do you like bright lights?
Early Reader · Change the reading level on the articleThis is a reddish-brown gas. It is in the air. It can come from cars or stoves. We must be careful with it. It can make our lungs hurt. Can you breathe clean air?
Early Reader · Change the reading level on the article