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 13 of 57
Things can feel a lot of push. You can pull a rubber band. You can also squeeze a soft sponge. This push or pull is called stress. It can change how things look. Have you ever squeezed something hard?
Early Reader · Change the reading level on the articleSmall things make up our world. They might look like tiny strings. These strings move and shake. This shaking makes different things. It can even make gravity. We want to know how it all works. Can you imagine tiny…
Early Reader · Change the reading level on the articleSome things make a bright red fire. This is from a special metal. It helps fireworks look pretty. It also helps make flares. It is found in rocks. Do you like red colors?
Early Reader · Change the reading level on the articleThings can swap places. One part leaves a group. A new part takes its spot. This helps make new things. It is like a game of musical chairs. Can you think of a swap?
Early Reader · Change the reading level on the articleSome salts are found in our world. These salts help grow food. They are used in soap for hair. Some help fix broken bones. We see them in many places. Can you find them today?
Early Reader · Change the reading level on the articleSulfur is a bright yellow stone. It can be found near volcanoes. It is also in the air. We need it to live. It helps our hair and skin stay strong. Do you know any yellow things?
Early Reader · Change the reading level on the articleThis is a clear liquid. It looks like oil. It can eat through metal and rock. It can even turn sugar black. We must be very careful with it. Do you think it feels hot?
Early Reader · Change the reading level on the articleSome things can move power easily. They must be very cold. When they are cold, power flows with no stop. They can even float over magnets! This helps us make big machines. Can you imagine a floating magnet?
Early Reader · Change the reading level on the articleThings can join together. Two waves can meet in one place. They add up to make a new wave. This helps us understand how things move. It is like magic! Can you see the waves move?
Early Reader · Change the reading level on the articleSome thinkers have a big idea. They think every tiny bit of our world has a twin. This twin is a partner. It might be a different kind of bit. This could help us learn about space. Do you like finding twins?
Early Reader · Change the reading level on the articleWater has a skin. This skin pulls together. It makes round drops. It helps bugs float. This is very cool! Can you see it?
Early Reader · Change the reading level on the articleSvante was a smart man. He studied how our world works. He found out how air can change heat. This helps us learn about our Earth. He won a big prize for his work. Do you like to learn new things?
Early Reader · Change the reading level on the articleSome things look the same when you move them. A ball looks the same if you spin it. A room can feel the same in every spot. This helps us learn about our world. Can you find something that looks the same when you…
Early Reader · Change the reading level on the articleSome gas can help us move. This gas can run cars. It can also make food for plants. We use it to make many things. It is a very useful tool. Can you think of other uses for gas?
Early Reader · Change the reading level on the articleSome things are man-made. We can make these things. We use big tools to make them. They are not found in nature. We can learn how to make them. Do you like to build things?
Early Reader · Change the reading level on the articleA system is a group of parts. These parts work together. They follow rules to do a job. Some parts come from nature. Some parts are made by people. Systems help the world work. Can you find a system?
Early Reader · Change the reading level on the articleSome plants have a special part. It is in bark and fruit. It can make your mouth feel dry. It also helps plants stay safe. Do you feel this when you drink tea?
Early Reader · Change the reading level on the articleTantalum is a strong metal. It is a dark blue-gray color. This metal does not rust easily. It helps make parts for computers. We use it in many things. Can you find a computer?
Early Reader · Change the reading level on the articleA tiny part of our world is called a tau. It is much heavier than an electron. It is very small. It does not stay for long. It changes into other things. We use big tools to find it. Can you imagine something so small?
Early Reader · Change the reading level on the articleThis is a special metal. It is a silvery gray color. It can be made by people. It helps doctors see inside your body. It is very useful. Do you want to learn more?
Early Reader · Change the reading level on the articleTellurium is a rare metal. It looks like shiny silver. It is very hard to find. We use it to make solar panels. These panels catch light from the sun. It is a special thing. Do you like the sun?
Early Reader · Change the reading level on the articleTerbium is a special metal. It looks silvery and white. You can even cut it with a knife. It helps make lights work. It makes colors on a screen. It is a very cool thing. Do you like bright lights?
Early Reader · Change the reading level on the articleWe use a name for magnet strength. It is called a tesla. This name honors a man named Nikola Tesla. Magnets help us in many ways. They can even help doctors see inside you. Do you have a magnet at home?
Early Reader · Change the reading level on the articleA big ring helps us learn. It is in a place called Fermilab. It makes tiny bits move fast. This helps us find new things. It is very cool! Do you like science?
Early Reader · Change the reading level on the articleThallium is a shiny metal. It looks like silver. It can turn blue in the air. This metal is used to make things for computers. It can also help doctors look at hearts. Do you like shiny things?
Early Reader · Change the reading level on the articleSmart people use math to learn. They think about how things work. They try to guess what happens next. This helps us understand our big world. It is like a puzzle. Do you like puzzles?
Early Reader · Change the reading level on the articleA theory is a big idea. It helps us learn about the world. We use it to explain things. It can help us find new facts. We can think and look to learn. Do you like to learn new things?
Early Reader · Change the reading level on the articleThings can move in a loop. Heat can make things move. This helps cars go. It also helps keep food cold. We use this every day. It is like a big circle. Can you find a machine that uses a loop?
Early Reader · Change the reading level on the articleEnergy helps things move. Some energy is useful. It can push a heavy box. This is called free energy. It is the energy we can use to do work. Can you think of something that moves using energy?
Early Reader · Change the reading level on the articleSome things have a very strong smell. They can smell like eggs or garlic. Some even smell like a skunk! This smell helps us find gas. We use it to stay safe. Can you smell anything funny today?
Early Reader · Change the reading level on the articleThomas Young was a smart man. He studied many things. He learned how light moves like a wave. He also learned how we see colors. He helped us understand the world. Do you like to learn new things?
Early Reader · Change the reading level on the articleThorium is a special metal. It is bright and silver. It is found in the ground. It can help make power. It is very old. Do you like silver?
Early Reader · Change the reading level on the articleThulium is a special metal. It looks like bright silver. It is very hard to find in the ground. We use it to make lasers. It can even be in money! Have you ever seen a laser?
Early Reader · Change the reading level on the articleTime travel is a big idea. It means going to the past or the future. Some stories use a special machine. We can dream about seeing long ago. Do you want to see the future?
Early Reader · Change the reading level on the articleTin is a soft gray metal. You can bend it with your hands. It can even make a little sound! It is used to make cans for food. This helps keep our food safe. Do you like using tin cans?
Early Reader · Change the reading level on the articleThis is a strong metal. It is silver in color. It does not rust in the sea. It helps make fast planes. It can even help your body. It is a very cool metal. Do you like metal?
Early Reader · Change the reading level on the articleThis is a bright white powder. It is used in many things. It is in white paint. It is in some foods. It is in sunscreen, too. It helps keep your skin safe from the sun. Do you see white paint near you?
Early Reader · Change the reading level on the articleA ton is a way to measure weight. It is used for very heavy things. It can also mean a lot of something. You might say you have a ton of toys. It is a very big amount! Do you have a ton of books?
Early Reader · Change the reading level on the articleA twist is a special kind of push. It makes things turn or spin. You use it to turn a screw. It helps us move things that spin. Can you find something that spins?
Early Reader · Change the reading level on the articleSome metals are very special. They are shiny and strong. They help carry heat and power. They can even make bright colors. These metals are all around us. Do you see any shiny metals?
Early Reader · Change the reading level on the articleSome things let light pass through. You can see through clear glass. Some things let light in but look blurry. This is like a soft light. Other things block all the light. These things are dark. Can you find…
Early Reader · Change the reading level on the articleThings can be ice, water, or steam. Sometimes they are all together. This happens at one special spot. It is a very cool thing to see. Can you imagine all three at once?
Early Reader · Change the reading level on the articleThis is a strong metal. It is very heavy. It can stay solid when it is very hot. It is used in light bulbs. This metal helps us see in the dark. Can you find a light bulb?
Early Reader · Change the reading level on the articleSometimes things move in a messy way. This can be water or air. It moves in swirls and bumps. It is not smooth. It can be in a fast river. It can be in storm clouds. Can you see it move?
Early Reader · Change the reading level on the articleSome sounds are too high to hear. They are very fast sounds. Bats use them to find food. Doctors use them to see babies. This helps us learn about the world. Can you hear a high sound?
Early Reader · Change the reading level on the articleThe sun sends out special light. We cannot see this light. It can give us a sunburn. It also helps us stay healthy. Can you feel the warm sun?
Early Reader · Change the reading level on the articleTiny things are hard to see. We can find where they are. But then we cannot know how fast they move. If we know their speed, we lose their place. It is a big secret of nature. Can you imagine that?
Early Reader · Change the reading level on the articleWe use special ways to measure things. We use inches and feet. These help us know how long things are. They help us when we shop. It is a helpful way to learn. Do you like to measure things?
Early Reader · Change the reading level on the article