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 36 of 57
Some liquids flow in smooth layers. They slide past each other. There are no swirls or bumps. This happens when the liquid moves slowly. It looks very clear and neat. It can even flow over a wing. Can you see smooth…
Early Reader · Change the reading level on the articleTiny bits of air can stick to things. They find small spots to stay. Each spot holds just one bit. This makes a thin layer. It helps us learn about the world. Do you see things that stick?
Early Reader · Change the reading level on the articleTiny bits of matter can move fast. When they speed up, they send out waves. These waves carry energy away. This helps us make things like radios. It is a busy world! Can you see the waves?
Early Reader · Change the reading level on the articleSome heat is hidden. It helps things change. Ice turns into water. Water turns into steam. The heat stays hidden while this happens. It does not make things hotter yet. Can you find ice in your freezer?
Early Reader · Change the reading level on the articleLaura Bassi loved science. She was a great teacher. She was the first woman to get a science degree. This helped other women too. She worked very hard. Do you like to learn new things?
Early Reader · Change the reading level on the articleThings in our world stay the same. Water is made of parts. These parts are always the same. It does not matter where it comes from. This helps us know what things are. Do you like to learn about things?
Early Reader · Change the reading level on the articleThings in a mix can change. They can turn into new things. Some things change back and forth. This happens at a steady pace. It helps us know what will happen. Do you like to see how things change?
Early Reader · Change the reading level on the articleThings in our world mix in ways. Small bits join together. They join in simple ways. They use small groups of bits. This helps us learn how things work. It is like a pattern. Do you see patterns too?
Early Reader · Change the reading level on the articleThings in our world mix in patterns. Some parts join together in a set way. This helps us know how things work. It is a neat way to see how bits of stuff fit. Do you like to see how things fit together?
Early Reader · Change the reading level on the articleLawrence Bragg was a great scientist. He studied how tiny things look. He won a big prize for his work. He was very young when he won. His father worked with him too. Do you like to learn new things?
Early Reader · Change the reading level on the articleLawrence Krauss studies the stars. He is a science teacher. He writes books about space. These books help us learn. He wants us to love science. Do you like to look at the stars?
Early Reader · Change the reading level on the articleThis is a special metal. It is made by people in labs. It has a very short life. It helps us learn about science. It is named after a man. Do you like science?
Early Reader · Change the reading level on the articleSome white crystals taste sweet. People used them in food long ago. They also used them in hair dye. But these crystals can make you very sick. We must be careful with them. Do you think they look pretty?
Early Reader · Change the reading level on the articleThis is a white powder. It can go boom very fast. It is used to start big explosions. People must keep it under water. This keeps it safe. It is a very strong thing. Do you think it is loud?
Early Reader · Change the reading level on the articleThis is a bright yellow salt. It is used in paint. It makes colors look very bright. It is in some yellow paintings. We must be very careful with it. Do you like the color yellow?
Early Reader · Change the reading level on the articleThis is a white powder. It looks like tiny crystals. It can be used to make paint. We must be very careful with it. It can make us sick. Do you like to paint?
Early Reader · Change the reading level on the articleSometimes we add one second to our clocks. This helps our clocks match the Earth. The Earth does not always spin at the same speed. This extra second keeps our time right. It helps us stay on track. Can you imagine a…
Early Reader · Change the reading level on the articleTiny parts can break away. They leave a group of atoms. This helps a change happen. It is like a piece falling off. The change makes new things. Do you like to see how things change?
Early Reader · Change the reading level on the articleThings like to stay the same. If you change something, it tries to fix it. It works to fight the change. This helps things stay steady. It is like a little push back. Can you see how it works?
Early Reader · Change the reading level on the articleFast things look short. When things move very fast, they shrink. This only happens in the way they move. It does not happen at normal speeds. It is a big surprise! Do you think you could see it?
Early Reader · Change the reading level on the articleMagnets can move things in a wire. When a magnet moves, it makes power. This power pushes back. It tries to stop the change. This helps keep things steady. Do you like magnets?
Early Reader · Change the reading level on the articleLeo Esaki is a smart man. He found new ways for parts to work. His work helps us use tools. He won a very big prize. He likes to ask questions. Do you like to ask questions too?
Early Reader · Change the reading level on the articleLeon Cooper was a smart man. He studied how things work. He helped us learn about light and wires. His work helped many people. We can learn from him too. Do you like to learn new things?
Early Reader · Change the reading level on the articleLeon was a great scientist. He studied very small things. He won a big prize for his work. His work helps us learn about the world. He loved to teach. Do you like to learn new things?
Early Reader · Change the reading level on the articleLeo Szilard was a smart man. He found new ways to use energy. He also helped many people find jobs. His work helps us learn about the world. He was a very great thinker. Do you like to learn new things?
Early Reader · Change the reading level on the articleTiny bits make up our world. Some bits come in pairs. One kind goes one way. The other kind goes back. They must stay in balance. This helps everything work. Can you imagine tiny bits?
Early Reader · Change the reading level on the articleLev Landau was a smart man. He studied how things work. He learned about cold liquids. He won a big prize for his work. He helped us learn about our world. Do you like to learn new things?
Early Reader · Change the reading level on the articleScientists use pictures to show tiny things. These pictures show how small bits stick together. They use dots and lines for this. It helps us see how they join. This makes science fun to learn. Do you like looking at…
Early Reader · Change the reading level on the articleThis jar holds a spark. It is made of glass. Metal sheets go on the inside and outside. It helps us learn about power. It is very cool to see! Can you feel a tiny spark?
Early Reader · Change the reading level on the articleSmall bits of matter can stick to metal. They hold on tight. This helps the metal change. It can even change color. This is how many things work. Do you see metal things near you?
Early Reader · Change the reading level on the articleSome small things take up space. They can be big or small. This helps us see how they fit. It helps us make new things. It is very cool to see. Can you see the shape?
Early Reader · Change the reading level on the articleSome tiny things make colors. Small bits join with a metal. They hold on tight. This can change the color we see. It is very neat! Do you like bright colors?
Early Reader · Change the reading level on the articleLightning is a bright flash in the sky. It can hit the ground. It can also hit a tall tower. This can be dangerous for us. We must stay safe inside. Have you seen a flash in the sky?
Early Reader · Change the reading level on the articleWe use big tools to see space. These tools find ripples in space. They help us learn about stars. This helps us know our world. It is very cool. Do you like stars?
Early Reader · Change the reading level on the articleLime is a bright color. It looks like a lime fruit. It is a mix of yellow and green. This color helps people see fire trucks. It is easy to spot in the sun. Do you like this color?
Early Reader · Change the reading level on the articleSome oils smell like fruit. They come from orange peels. These oils help make food taste good. They also help clean things. It is a very useful oil. Do you like the smell of oranges?
Early Reader · Change the reading level on the articleSome people use a special liquid. It helps stop bugs on plants. It can also help stop lice. This liquid can be bad for us. It can make people feel sick. We use safer things now. Do you know about bugs?
Early Reader · Change the reading level on the articleTiny bits make up all things. These bits join to make new shapes. This helps us see how things bond. It helps us know how things work. We can learn a lot this way. Do you want to learn more?
Early Reader · Change the reading level on the articleSome tiny bits form a straight line. One bit stays in the middle. Two other bits sit on each side. This shape helps them stay apart. It is like a straight rod. Can you see the straight line?
Early Reader · Change the reading level on the articleThings can move in a straight line. You can run on a straight track. This is a simple way to move. It helps us see how fast things go. We can watch things move. Do you like to run fast?
Early Reader · Change the reading level on the articleA machine makes tiny bits go fast. It uses a long tube. The bits fly in a straight line. This helps doctors help sick people. It is very cool! Do you want to see it go?
Early Reader · Change the reading level on the articleLight moves in many ways. It can move up and down. It can also move side to side. Some light only moves in one way. This helps us see things clearly. It is very cool! Can you see the light?
Early Reader · Change the reading level on the articleSome purples are special. They are made by mixing red and violet. These colors are very bright. They look very pretty. Do you like purple? Can you find a purple toy?
Early Reader · Change the reading level on the articleSome things like to mix with oil. They do not mix with water. This helps soap clean your clothes. It also helps your body work. Soap pulls oil away from dirt. It is very helpful! Do you like using soap?
Early Reader · Change the reading level on the articleSome things are in the middle. They flow like water. But they also point one way like a solid. We use them in screens. This helps you see pictures. Do you like screens?
Early Reader · Change the reading level on the articleSome liquids can make things move. We use them in cars. They help us go on trips. This fuel is very useful. Do you like to ride in a car?
Early Reader · Change the reading level on the articleHelium can turn into a liquid. It must be very, very cold. This liquid helps big machines work. It keeps them cool. It is a special kind of cold. Do you like the cold?
Early Reader · Change the reading level on the articleSome gas can turn into a liquid. This happens when it gets very cold. It is used to help big rockets fly. This fuel helps us reach space. It is a very cool thing to see. Do you like looking at the stars?
Early Reader · Change the reading level on the article