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Take a closer look at how the atmosphere keeps our planet warm.

All living organisms need energy to live. Organisms such as plants get this energy from the Sun. But animals get this...

How enlightened are you about the subject of light? Play this trivia game to find out!

The world's largest flower grows in the rainforests of Southeast Asia. But its enormous, bright red bloom does not fi...

Albert Einstein is famous for making many revolutionary discoveries. But perhaps Einsteins most famous discovery was...

For thousands of years, humans have relied on the power of wind to sail across oceans, pump water, and grind grain.

Ninety-three million miles from Earth, a giant ball of hot gas brightens the sky. Nuclear reactions in the Sun's core...

Most mass in the universe is not normal matter we can see, like stars, planets, and puppies. In fact, 80% of the mass...

Explore the connections between technology, population and rising atmospheric CO₂.

When you ride in a car, watch your favorite television show, or take a hot shower, you're most likely using fossil fu...

Scientists are developing and improving "clean" energy sources. But for the next hundred years, the world w...

Scientists believe that everything in the Universe began about 13 billion years ago in a giant explosion called the B...

Find out about Earth's climate, its consequences, and what we can do.

We see light every day -- whether from light bulbs, flames, flashlights, or the Sun (our most important source of lig...

Take an enlightening look at light with these three easy experiments.

In 1964, two astronomers at Bell Labs in New Jersey started testing a horn-shaped radio antenna.

Look at all the things around you -- your computer, your finger, your desk, even the trees outside. They're all made...

What can be used to perform surgery, cut metal, and even listen to your favorite CD? A laser! The term "laser&qu...

Simple things that you can do to help protect fresh water and the living things that depend on it.

Arctic ice is melting. Coral reefs are disappearing. Sea levels are rising. These events are part of an even bigger p...

A star is a huge glowing ball of hot gas. Deep inside its core, hydrogen atoms smash together, forming helium and rel...

Want to turn something old into something new?

Find out more about global warming. How, and why, we should slow it?

There is nothing in the world like water. Without it, our world would be a very different place. Water covers over tw...

Take a deep breath and exhale slowly. Your body just released carbon dioxide, a colorless gas that's essential to lif...

To find north, find Polaris. Earth rotates on its axis, which points directly at Polaris. From Earth, Polaris is the...

Find out how biodiversity depends on you.

Explore some surprising ways that organisms get the food that they need.

Albert Einstein was a Nobel Prize-winning physicist who changed the way we think about our world and our Universe.

Marie Sklodowska Curie was born in Poland during a time when women were prohibited from receiving a college education.

When someone asks you, "What time is it?," the answer's easy. Just look at your watch! But "What is ti...

Mass and weight may seem like the same thing, but in fact these two measurements are very different. Mass is the tota...

Reading + Video

Astronomy is a BIG subject. We've brought learning about it down to size with these big ideas.

Find out what makes the Sun glow, and other amazing facts, in an up-close interview with the Sun.

Einstein might never have become a worldwide celebrity had it not been for the English astrophysicist Arthur Eddington.

A bike, a tree, a cloud, an ocean -- any object you can name -- it's all made of matter. Even YOU are made of matter....

Plankton are the microscopic organisms of the sea. Just as plants form the basis for the ecosystem on land, phytoplan...

Winter brings snow and ice in places like northern Minnesota. But during the same season along Florida's beaches, tem...

On a clear night, Mike Shara sees more than just the beautiful twinkling of stars when he gazes at the sky.

Can you build a successful wasp colony? Make the right choices and your offspring might have a future!

If there's life on any other planet in our solar system, it's probably on Mars. Scientists have sent orbiters, lander...

Is this animal a tadpole, frog, salamander, or lizard? Take a guess!

Galileo was a "jack of all trades." He was a musician, a philosopher, a physicist, and an astronomer. He is...

Find out what you can do to protect the oceans and ocean life.

Test your knowledge about the water you didn’t know you were using.

How do horses move? Find out with these flipbooks.

Make a 3D diorama! All you need are pasta, Play-Doh, pipe cleaners, pom-poms, and hair curlers.

With its swirling column of wind, a tornado is one of nature’s most destructive storms.

Reading + Video

Earthquakes are happening all the time. Find out what makes the earth shake.

Think you're an expert on changing climate? Test your knowledge with this quiz!

Have you ever wondered why and how fireflies flash?

Dinoflagellates are tiny, one-celled organisms that live in oceans and freshwater ponds, rivers, and streams. Some di...

Video

Watch these videos to explore Felicity's work as a conservation biologist.

Video

What does this marine biologist like most about her work? Find out!

How is the ocean like a layer cake? What creatures live there? And how important is the ocean? Take a dive and find out!

Water is a precious resource, and all things need water to survive.

OLogy learning: Find resources for K-5 grade levels.