A twig is just a twig—or is it? You can identify a plant, tree, or shrub just by closely observing one small part of it. After this activity, you'll never again dismiss a twig.

Can you name the mystery arthropod named for its hundred-some legs? More important, do you know what physical and behavioral characteristics it shares with a shrimp or honeybee?

Earth's climate is changing, and according to scientists today's kids will bear the brunt of the potentially damaging affects of a warmer world. Find out how scientists are preparing now for the potential negative consequences.

"Greenhouse effect" and "global warming" are becoming household phrases but how, exactly, are they linked? Explore the interconnections and consequences of climate change.

What's the size of your desk in relation to your teacher's? Or to the chalkboard at the front of the room? Hone your mapping skills with this classroom activity.

Some scientists believe the fate of humankind was changed when humans first began to tame the wild horse. Learn more about how horses have shaped our world.

Focus on the best books about astronomy, astrophysics, light, telescopes, digital imaging, and the 3-D universe with this list of recommended titles, suitable for older students and adults.

Did you know that squamates have a third eye? Or that the Gila Monster and the Bearded Lizard are the only two known venomous lizards? Discover more interesting facts about squamates.

It's not surprising that the larger the world's population grows, the more fresh water we consume. But what is surprising is just how much of this precious commodity we've depleted in recent years.

Did you know that the world's deserts keep expanding each year? Or that islands have the highest animal extinction rate—75 percent? Take a closer look at the major habitats found on Earth.