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 21 of 57
This is a clear liquid. It smells sweet. It was used to help people sleep during doctors' visits. Now, it helps make things like pans. It can also be found in seaweed. Do you like sweet smells?
Early Reader · Change the reading level on the articleA special gas is in the air. It comes from plants and the sea. It is even found in space! It helps make things in big factories. This gas is all around us. Can you find it in the air?
Early Reader · Change the reading level on the articleSome things make bright colors. They can be red or yellow. These colors help paint things. They can even help protect metal. We must be careful with them. They can make us sick. Do you like bright colors?
Early Reader · Change the reading level on the articleLenses help us see. Sometimes they do not work well. They can make colors look blurry. You might see a rainbow edge. This happens when colors do not land in the same spot. Can you see the colors?
Early Reader · Change the reading level on the articleColors have many parts. One part is the kind of color. Another part is how bright it is. This helps us name every color. It makes colors easy to see. Do you have a favorite color?
Early Reader · Change the reading level on the articleThis is a bright yellow color. It is used in paints. It can also be used for clothes. Some old paintings use it. It can turn brown over time. Do you like bright colors?
Early Reader · Change the reading level on the articleThis is a bright red powder. It is made of metal. It can look like small red crystals. It does not mix well with water. It is very pretty to see. Do you like the color red?
Early Reader · Change the reading level on the articlePeople study how time works. We use clocks to tell time. We can use tools like a sun dial. This helps us know when to sleep. It helps us plan our day. Do you like to use a clock?
Early Reader · Change the reading level on the articlePeople use rules to name colors. These rules help us see. They help make things like paint. They also help make TVs. This makes colors look right. Do you have a favorite color?
Early Reader · Change the reading level on the articleWe see many colors. A special way helps us name them. It uses light and three color paths. One path is for red and green. One is for blue and yellow. It helps us see tiny changes. Can you name your favorite color?
Early Reader · Change the reading level on the articleComputers use math to show colors. This helps make bright lights look real. It helps us see colors on a screen. It makes our pictures look good. Do you like bright colors?
Early Reader · Change the reading level on the articleCinnamon trees make a special oil. This oil smells very sweet. It gives cinnamon its tasty flavor. We use it in candy and gum. It can even help stop bugs. Do you like the smell of cinnamon?
Early Reader · Change the reading level on the articleThings can move in a circle. A fan spins in a circle. A stone on a rope can spin too. This helps things move in a round way. It is fun to watch. Can you see things moving in a circle?
Early Reader · Change the reading level on the articleLight can move in a circle. It spins like a wheel. It can spin left or right. This helps us see things. It can even help us watch movies. Can you see the spinning light?
Early Reader · Change the reading level on the articleThings can move in a circle. This can happen in water. It can happen in the air, too. This helps planes fly high. It is a way to see how things spin. Do you see things spin?
Early Reader · Change the reading level on the articleTiny bits of stuff can fit together in two ways. Some bits stay on one side. Other bits go to the other side. This changes how they act. It can even change if they are hard or soft. Do you see how they fit?
Early Reader · Change the reading level on the articleSome plants have a lemon smell. This smell comes from a special oil. It can make food taste good. It can make perfumes smell fresh. We use it in many things. Can you smell a lemon?
Early Reader · Change the reading level on the articleSome plants smell like lemons. This smell comes from a special oil. It helps keep bugs away. It can even stop tiny mold. It helps us stay safe. Do you like lemon smells?
Early Reader · Change the reading level on the articleTiny bits of power move around. They can push or pull things. This power makes light and radio waves. It helps our world work. It is very cool to see. Can you feel the power?
Early Reader · Change the reading level on the articleFields are all around us. They can move things. One field is the wind. It moves the air. Another field is gravity. It pulls on us. Do you feel the wind? It is a field too!
Early Reader · Change the reading level on the articleTiny things act in strange ways. Big things like balls act differently. A ball looks like it stays still. It does not act like a tiny speck. Big things follow simple rules. We can see these rules work. Do you like…
Early Reader · Change the reading level on the articleScience helps us know how things move. It works for big things like stars. It works for things we can touch. This helps us see our world. It is fun to learn. Do you like to see how things work?
Early Reader · Change the reading level on the articleSmart people want to find one big rule. This rule would explain how everything works. They look at how things pull and move. It helps us know our world. Do you like to learn how things work?
Early Reader · Change the reading level on the articleSome tiny things act like little cages. They trap other small things inside. These cages can be made of water. They can even hold gas. This helps us store things. It is like a tiny house. Can you find a cage?
Early Reader · Change the reading level on the articleClaude was a smart man. He used light to cool tiny bits. This work helped him win a big prize. He studied how things work. It is fun to learn! Do you like science too?
Early Reader · Change the reading level on the articleClaude Louis Berthollet was a scientist. He studied how things change. He found a way to make colors fade. This helps clean clothes. He also helped name things in science. Do you like to learn new things?
Early Reader · Change the reading level on the articleNavier was a man who built things. He made many bridges for cars and people. He used math to help his work. His name is on the big Eiffel Tower. He was a great thinker. Do you like to build things?
Early Reader · Change the reading level on the articleA wise woman lived long ago. She studied how things change. She used tools to make things. She wrote books about her work. Her ideas help us learn today. Do you like to learn new things?
Early Reader · Change the reading level on the articleClifford Shull was a smart man. He studied how tiny things work. He used small bits to see atoms. This helps us make better things. He won a very big prize. Do you like to learn new things?
Early Reader · Change the reading level on the articleClinton was a smart man. He studied how small things move. He found that tiny bits act like waves. This helps us learn about our world. It is very cool! Can you think of a wave?
Early Reader · Change the reading level on the articleSome things stay inside a box. No new stuff can get in. No stuff can get out. Heat can still move in or out. This helps us study things. It makes science easier. Can you think of a closed box?
Early Reader · Change the reading level on the articleSome metal is made in special machines. This metal sends out tiny rays. These rays can clean tools at a hospital. They also help doctors treat sick people. We must be very careful with it. Do you want to learn more?
Early Reader · Change the reading level on the articleWaves can move together. They can add up to be big. They can also cancel out. This happens when they match. This helps us make cool things. Do you like seeing bright light patterns?
Early Reader · Change the reading level on the articleWe use many ways to measure things. Some ways work well together. They help us do math easily. This makes science much better. It helps us understand our world. Do you like to measure things?
Early Reader · Change the reading level on the articleCold means it is not warm. It can be in the air. It can be in ice. Cold makes you shiver. It can make your skin bumpy. It is good to stay warm. Do you like the snow?
Early Reader · Change the reading level on the articleSome people thought they found a new way to make heat. They used special water and metal. It made more heat than they put in. This could help us make power. But other people could not do it. Do you think it will work?
Early Reader · Change the reading level on the articleMachines crash tiny bits together. They move fast in two ways. The bits hit each other hard. This helps us learn about things. It shows how the world works. It is very cool! Can you imagine tiny bits crashing?
Early Reader · Change the reading level on the articleMixing things into water changes it. It can make water boil faster. It can also stop water from freezing. This helps melt ice on roads. It works because of how much you add. Can you think of something you mix in water?
Early Reader · Change the reading level on the articleA tool helps light move in a straight line. It makes a beam thin and neat. This tool helps us see things clearly. It can even help doctors treat sick people. It is a very smart tool. Do you like to see straight lines?
Early Reader · Change the reading level on the articleThings hit each other. This is a hit. It can be a big hit. It can be a small hit. Sometimes things bounce. Sometimes they stick. Have you seen things hit?
Early Reader · Change the reading level on the articleTiny bits of stuff move fast. They bump into each other. They do this all the time. These bumps help things happen. It is like a busy dance. Do you see things bumping?
Early Reader · Change the reading level on the articleTiny bits hit each other. They must hit just right. They also need to hit hard. This makes new things. It helps things change. Can you see them move?
Early Reader · Change the reading level on the articleTiny bits make up our world. These bits have special traits. Some are red, green, or blue. They must mix to be plain. This helps them stay together. It is like a secret code. Can you find colors in your room?
Early Reader · Change the reading level on the articleGold can be many colors. It can be pink or white. It can even be blue! We mix gold with other metals to change it. This makes pretty jewelry for you. What is your favorite color?
Early Reader · Change the reading level on the articleColors can look very bright. Some colors are not white or gray. They are very strong. This helps us see the world. It is fun to look at colors. Do you have a favorite color?
Early Reader · Change the reading level on the articleWe use many colors. Some colors come from light. Some colors come from paint. You can mix them to make new ones. It is fun to see! Can you find your favorite color?
Early Reader · Change the reading level on the articleColors can be grouped in special ways. Some colors come from light. Other colors come from ink. This helps us see the same colors on screens. It also helps us see them on paper. Do you have a favorite color?
Early Reader · Change the reading level on the articleWe can separate a mix. We use a tall tube. A liquid flows through it. Some parts move fast. Other parts move slow. This helps us find one thing. Can you see them move?
Early Reader · Change the reading level on the article