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 54 of 57
Try Science Lab activities about forces and motion, light, sound and electricity or matter and chemistry.
Things can change in many ways. Some things go in a circle. They start and end in the same spot. Other things move from one place to another. This helps us build machines. Can you think of a machine?
Early Reader · Change the reading level on the articleThings have a way they are. We can see how hot they are. We can see how much space they take. This helps us know what is happening. It is like a snapshot in time. Can you feel how warm the air is?
Early Reader · Change the reading level on the articleA system is a group of things. It can be in a box. Some things can move in and out. Some things stay inside. This helps us learn how things work. Can you find a system near you?
Early Reader · Change the reading level on the articleEverything is made of tiny bits. These bits move around. When they move fast, things are hot. When they move slow, things are cold. At the coldest point, they almost stop. Can you feel the cold?
Early Reader · Change the reading level on the articleA tool can weigh things. It gets very hot. We watch how much weight is left. This helps us learn about new things. It is like a tiny scale in a hot oven. Can you guess what it finds?
Early Reader · Change the reading level on the articleSome things change when they get hot. Heat can break them down. This can happen to tiny bits in our bodies. It can even happen to medicine. Heat makes them lose their power. Can you feel the heat from the sun?
Early Reader · Change the reading level on the articleSome things do not change in heat. Most things break when they get hot. But some tiny parts stay strong. They can live in very hot places. This helps them do their jobs. Can you imagine being that tough?
Early Reader · Change the reading level on the articleWe can use a special plate to see what is inside a mix. A liquid moves up the plate. It carries the mix with it. Some parts move fast. Other parts move slow. This makes them separate into spots. Can you see the…
Early Reader · Change the reading level on the articleA thin lens is very slim. It helps move light. This light can make a new picture. You see things through them. It helps us see well. Do you like to look through a lens?
Early Reader · Change the reading level on the articleSome salts come from sulfur. They help make colors for clothes. They also help make old photos. This helps us see things clearly. It is a very useful thing. Do you like bright colors?
Early Reader · Change the reading level on the articleThings get very still when they are cold. At the coldest point, everything stops moving. This point is called absolute zero. It is hard to reach this cold spot. We can never truly get there. Do you like the cold?
Early Reader · Change the reading level on the articleA man named Seebeck found a secret. He saw that heat can move things. When metal is hot and cold, it moves a tiny needle. This helps us tell how hot things are. It is a neat trick! Do you like to learn about heat?
Early Reader · Change the reading level on the articleLight can bounce off tiny bits. These bits move when light hits them. Then, the light moves away. This helps us see the Sun. It also helps us see far space. Can you see the light?
Early Reader · Change the reading level on the articleSpace has many things in it. Sometimes three things pull on each other. They move in wild ways. It is hard to know where they go. This helps us learn about the stars. Can you see them move?
Early Reader · Change the reading level on the articleWires carry power to us. They use three wires to move it. This helps move power far away. It helps big machines work well. This makes our lights turn on. Can you find a wire?
Early Reader · Change the reading level on the articleLightning makes a loud noise. This noise is called thunder. It happens when lightning gets the air very hot. The hot air moves very fast. This makes a big sound. It can be a loud crack or a low rumble. Do you hear…
Early Reader · Change the reading level on the articleSome plants have a special smell. This smell comes from thyme. It can help clean things. It is used in mouthwash too. It helps keep us healthy. Do you like the smell of thyme?
Early Reader · Change the reading level on the articleThe moon pulls on our world. It pulls on the water. This makes the ocean move. The water grows in big bumps. This is how tides work. Can you see the waves?
Early Reader · Change the reading level on the articleSounds have a special feel. A piano sounds different from a guitar. They can play the same note. But we still know which is which. It is like a special sound color. Can you hear the difference?
Early Reader · Change the reading level on the articleTime can move at different speeds. Fast things make time slow down. A clock on a fast ship ticks slowly. It might even go to the future! This helps us use maps in space. Can you imagine moving that fast?
Early Reader · Change the reading level on the articleTime tells us when things happen. Long ago, people used the sun. They watched the sun move in the sky. Now, we use special clocks. These clocks are very good. They help us all stay on track. Can you tell the time?
Early Reader · Change the reading level on the articleWe use clocks to tell time. Clocks help us know the day. Long ago, we used the Earth to tell time. Now, we use special machines. These machines are very good. They help us all stay on time. Can you look at a clock?
Early Reader · Change the reading level on the articleSome white powder comes from tin. It can be found in the ground. It helps make shiny glass and tiles. It can even help make colors for clothes. This powder is very useful. Do you like bright colors?
Early Reader · Change the reading level on the articleThis is a very hard stuff. It looks like shiny gold. We use it to protect tools. It can also be on jewelry. It is safe for the body. It stays strong for a long time. Do you like gold color?
Early Reader · Change the reading level on the articleScientists use a special test. They mix liquids to learn a secret. They watch for a color change. This helps them find out what is inside. It is like a science puzzle. Can you find colors in science?
Early Reader · Change the reading level on the articleTNT is a strong stuff. It can make a big boom. It is used in mines. It helps people dig in the ground. It is very useful. Do you know what else makes a boom?
Early Reader · Change the reading level on the articleWe use a special way to measure power. It helps us know how big an explosion is. We compare it to a kind of fuel. This helps us understand big events. Can you imagine a very big blast?
Early Reader · Change the reading level on the articleA tokamak is a big machine. It makes heat. It uses magnets to hold hot gas. This gas can make power for us. It is like a giant ring. Can you imagine a ring of sun heat?
Early Reader · Change the reading level on the articleSome liquids help us make things. They are used in glue and paint. This liquid can also be in gas for cars. It is not safe to breathe in. It can make you feel very sick. Do you use paint at home?
Early Reader · Change the reading level on the articleA tonne is a way to measure weight. It is used for very heavy things. It is much heavier than a small bag. It is like a big box of water. We use it to talk about big loads. Do you know something that heavy?
Early Reader · Change the reading level on the articleThings can be in many forms. Some are hard like a rock. Some flow like water. New things can be made from tiny bits. These bits can link in special ways. This helps us build new tools. Can you find things that are…
Early Reader · Change the reading level on the articleSome tiny bits make up our world. One bit is very heavy. It is called a top quark. It is a big part of how things work. We use big machines to find it. Do you like learning about tiny things?
Early Reader · Change the reading level on the articleA torr is a way to measure push. It measures the push of the air. People use it to study space. It helps us know how much air is there. It is a very small amount. Do you like to study the air?
Early Reader · Change the reading level on the articleYou can twist things. This is called torsion. It happens when you turn an object. A long rod can twist too. This can even break things like chalk. Can you twist a piece of chalk?
Early Reader · Change the reading level on the articleToshihide Maskawa was a smart man. He studied how tiny things work. He won a very big prize. This prize helps us learn about our world. Do you like to learn new things?
Early Reader · Change the reading level on the articleLight can act like a mirror. It can bounce off water. This happens at a certain angle. It helps us see things. It makes light travel in a line. Can you see the light bounce?
Early Reader · Change the reading level on the articleSome things are very tough. They can take a big hit. They do not break easily. This helps us build fast ships. It keeps us safe. Can you think of something tough?
Early Reader · Change the reading level on the articlePeople once used a special spray. It helped cotton plants grow. This spray was not safe for us. It can hurt animals and people. Now, we do not use it. Do you like to help the earth?
Early Reader · Change the reading level on the articleSome metals can be bad for us. They are found in the ground. People can get them from food or air. They can make us feel sick. We must be careful. Do you know any metals?
Early Reader · Change the reading level on the articleSome things are very small. We only need a tiny bit. These small things help us grow. They help our bodies work well. They can even be in rocks. We must be careful with them. Can you find small things?
Early Reader · Change the reading level on the articleA trajectory is a path. It is the way things move. Think of a ball in the air. It follows a line through the sky. This path helps us know where things go. Can you see a path in the sky?
Early Reader · Change the reading level on the articleTiny bits of stuff crash together. They make a quick change. This change happens very fast. It helps make new things. It is a big, busy moment. Can you imagine tiny bits moving?
Early Reader · Change the reading level on the articleSmall bits of stuff change into new things. They must pass through a special spot first. This spot helps them change. It is like a tiny hill to climb. This helps us know how fast they change. Can you see how they move?
Early Reader · Change the reading level on the articleLight can move through things. Some light goes all the way through. Some light bounces back. This helps us see colors. It is like a magic trick. Can you see light through a window? We see it every day.
Early Reader · Change the reading level on the articleThings move in our world. Heat moves from warm to cold. Smells move through the air. Water moves too. These things help us live. Do you see things moving?
Early Reader · Change the reading level on the articleSome things are made in labs. They do not live in the ground. We make them with big tools. They can help us stay safe. One can help a smoke alarm. Can you find a smoke alarm? It helps us in our homes.
Early Reader · Change the reading level on the articleLight and radio waves move in patterns. These patterns stay in a set shape. They can move through thin glass wires. They can also move through metal tubes. This helps us send signals to you. Do you like to play with…
Early Reader · Change the reading level on the articleSome waves move in a funny way. They move up and down. But they travel in a straight line. You can see this on a drum. It is very cool! Can you find a wave today?
Early Reader · Change the reading level on the article