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 37 of 57
We can use liquids to clean things. You mix two liquids that do not stay together. One liquid pulls things out of the other. This helps make things pure. It can even help make medicine. Do you like to mix things?
Early Reader · Change the reading level on the articleThis is a very cold liquid. It stays cold to freeze things fast. It can even make yummy ice cream! We must be very careful with it. It is too cold to touch. Can you imagine something that cold?
Early Reader · Change the reading level on the articleThis is a special blue liquid. It is the air we breathe. But it is very cold. It helps big rockets fly into space. It can even float near a magnet! Do you like looking at the stars?
Early Reader · Change the reading level on the articlePeople mix metals to make new ones. One main metal is copper. It is cheap and easy to find. We add other metals to it. This makes it strong. It can even help stop rust. Do you like shiny metal?
Early Reader · Change the reading level on the articleTiny bits make up everything. These bits are very small. They build the world around us. They help make you and me. It is all so cool! Can you find small things?
Early Reader · Change the reading level on the articleScientists have big questions. They want to know how the world works. They study space and tiny things. Some things are still a mystery. We are still learning new things. Can you help us find out?
Early Reader · Change the reading level on the articleThis is a special white powder. It can help make new things in a lab. It can even hold gas for cars. Be careful because it reacts with water. It can be very fast! Can you imagine a powder that holds gas?
Early Reader · Change the reading level on the articleThis is a special kind of salt. It can hold a lot of power. Some people think it could be fuel for cars. It can even make gas. It is very strong. Do you like fast cars?
Early Reader · Change the reading level on the articleThis is a special kind of salt. It is made of two things. It is very light. It can catch on fire in wet air. It can even be used for rockets. Do you want to learn more?
Early Reader · Change the reading level on the articleThis is a pink solid. It comes from metal and air. It can hold gas inside it. This helps us save things. It is very strong. Do you like the color pink?
Early Reader · Change the reading level on the articleThis is a white or pale yellow solid. It can be made by burning metal in the air. It helps make colors on clay pots. It can make blue or pink colors. It is very interesting! Do you like bright colors?
Early Reader · Change the reading level on the articleLitmus is a special color. It comes from moss. This color helps us test things. Blue paper turns red in some liquids. Red paper turns blue in others. It is like magic! Do you like bright colors?
Early Reader · Change the reading level on the articleScientists made a new thing. It is not found in nature. They made it in a lab. It does not last long. It is very special. Can you find it?
Early Reader · Change the reading level on the articleTiny bits of matter pull on each other. They move around very fast. This movement makes a small pull. This pull helps things stay together. It can turn gas into liquid. Can you feel things stick together?
Early Reader · Change the reading level on the articleSome waves move in a line. They push and pull the air. This makes a sound. You can hear it with your ears. It is like a toy spring moving. Can you hear a sound now?
Early Reader · Change the reading level on the articleA long ton is a way to weigh things. It is used for big ships. It is much heavier than a short ton. This helps people move large goods. It is a very big weight. Can you imagine something that heavy?
Early Reader · Change the reading level on the articleSpace is like a fine fabric. It is made of tiny loops. These loops are all woven together. This helps us learn how the world works. It is very small! Can you imagine tiny loops?
Early Reader · Change the reading level on the articleLoránd Eötvös was a smart man. He studied how the Earth pulls on things. He made a tool to help find oil. His work helps us learn about our world. Do you like to learn about space?
Early Reader · Change the reading level on the articleRules of nature stay the same. They do not change for you. They do not change for us. This helps us know how things work. It is a very cool rule. Do you like to learn how things work?
Early Reader · Change the reading level on the articleThings change when they move fast. Time can slow down. Things can even look shorter. This happens when things move very, very fast. It is a big part of how our world works. Can you imagine moving that fast?
Early Reader · Change the reading level on the articlePeople use math to study light. It helps us see how light moves. This math makes big rules easier. It helps us learn about our world. We can learn so much! Do you like to learn?
Early Reader · Change the reading level on the articleThings usually move in one way. They do not go back. A broken cup stays broken. We see time move forward. This is like a one-way street. Can things ever go back? What do you think?
Early Reader · Change the reading level on the articleSome sounds are quiet. Some sounds are loud. We hear how loud a sound is. It can be a soft whisper. It can be a big shout. This helps us hear the world. Do you like loud sounds?
Early Reader · Change the reading level on the articleHal Gray was a smart man. He studied how light can change life. He helped doctors treat sick people. His work helped us learn a lot. We even named a unit after him. Do you like science?
Early Reader · Change the reading level on the articleLouis was a smart man. He studied how magnets work. His work helps computers stay on. He won a very big prize. He was a great thinker. Can you find a magnet?
Early Reader · Change the reading level on the articleOil helps things move. It stops things from rubbing. This keeps parts from getting hot. It also keeps food from sticking in a pan. It helps machines work well. Do you use oil at home?
Early Reader · Change the reading level on the articleLudwig Prandtl was a smart man. He studied how air moves. This helps us build fast planes. He also looked at how water flows. His work helps us fly high. Do you like to watch planes fly?
Early Reader · Change the reading level on the articleLuis Alvarez was a smart man. He studied how the world works. He found many new things. He even helped planes land safely. He won a very big prize. Do you like to learn new things?
Early Reader · Change the reading level on the articleLight can look very bright. Some things shine a lot. A screen or the sun can be bright. This can hurt your eyes. We must be careful. Do you like bright lights?
Early Reader · Change the reading level on the articleSome things can make their own light. It is not from heat. It is called cold light. This light can come from a reaction. It can even come from living things. Do you like things that glow?
Early Reader · Change the reading level on the articleLong ago, people thought space was full. They thought a hidden thing carried light. This thing was called the aether. It helped light move like a wave. But we found out it is not there. Now we know how light works!…
Early Reader · Change the reading level on the articleLight can be measured. We see how much light a bulb gives off. This helps us pick the best bulbs. It tells us how much light we see. It is called a lumen. Can you see the light?
Early Reader · Change the reading level on the articleSome lights look very bright. This is how we see them. Our eyes see some colors best. Green light looks very bright to us. A small candle shows this well. It helps us see in the dark. Do you like bright lights?
Early Reader · Change the reading level on the articleSome liquids help us clean. They help make soap too. People use them to make food. They can even make noodles chewy. We must be very careful with them. They can hurt our skin. Have you ever seen soap being made?
Early Reader · Change the reading level on the articleSome things are big. You can see them with your eyes. A ball is a good example. You do not need a tool to see it. It is easy to look at. Can you see big things around you?
Early Reader · Change the reading level on the articleMagenta is a bright color. It looks like red and blue mixed. It is used in many printers. This helps make all colors. It is a fun color to see! Do you like this color?
Early Reader · Change the reading level on the articleThis is a very strong liquid. It can melt things fast. It even melts wax from a candle. This liquid is very powerful. We must be very careful with it. Do you think it is amazing?
Early Reader · Change the reading level on the articleThis is a special kind of salt. It can come from the sea. We use it to melt ice on roads. It even helps make tofu food. It is very useful! Can you find salt in your kitchen?
Early Reader · Change the reading level on the articleThis is a special kind of salt. It helps your tummy work. It pulls water into your body. This helps you go to the bathroom. It can also be a pill. Do you like to stay healthy?
Early Reader · Change the reading level on the articleThis is a white mineral. It looks like a white stone. It can help your tummy feel better. It can even help plants grow. It is very useful. Do you like white rocks?
Early Reader · Change the reading level on the articleThis is a white powder. It can also look like brown dust. It helps make strong iron. It can even come from space! It is a very cool thing. Do you like looking at stars?
Early Reader · Change the reading level on the articleSmall magnets have two ends. One end pulls. The other end pushes. This helps magnets work. It makes them move. We see this in tiny things. Can you find a magnet?
Early Reader · Change the reading level on the articleMagnets have invisible paths. These paths go through spaces. We can count how many paths go through a shape. This helps us make power. It is like magic! Can you feel a magnet?
Early Reader · Change the reading level on the articleSome things move in small steps. A special ring can hold magnets. It holds them in tiny bits. These bits are always the same size. This helps us measure things well. Can you find a magnet?
Early Reader · Change the reading level on the articleA magnet has a special strength. It can pull or push on things. This strength helps it work. It can even turn in a field. Do you like magnets?
Early Reader · Change the reading level on the articleMost magnets have two ends. One end is north. One end is south. If you break a magnet, you get two new ones. Each one still has two ends. Could a magnet have only one end? We do not know yet. Do you think it could?
Early Reader · Change the reading level on the articleTiny bits in an atom move in ways. They can spin or turn. This tells us where they are. It helps us learn how they work. It is like a tiny dance. Can you imagine a tiny dance?
Early Reader · Change the reading level on the articleMagnets can make things move. This helps us see inside the body. It can also help make fast computers. This is a very cool way to look at things. We can learn so much from it. Do you like magnets?
Early Reader · Change the reading level on the article